diff --git a/common/lib/capa/capa/responsetypes.py b/common/lib/capa/capa/responsetypes.py
index ffd0d2cec0..2720f0e28a 100644
--- a/common/lib/capa/capa/responsetypes.py
+++ b/common/lib/capa/capa/responsetypes.py
@@ -1710,6 +1710,8 @@ class NumericalResponse(LoncapaResponse):
 
     def __init__(self, *args, **kwargs):
         self.correct_answer = ''
+        self.additional_answers = []
+        self.additional_answer_index = -1
         self.tolerance = default_tolerance
         self.range_tolerance = False
         self.answer_range = self.inclusion = None
@@ -1720,6 +1722,10 @@ class NumericalResponse(LoncapaResponse):
         context = self.context
         answer = xml.get('answer')
 
+        self.additional_answers = (
+            [element.get('answer') for element in xml.findall('additional_answer')]
+        )
+
         if answer.startswith(('[', '(')) and answer.endswith((']', ')')):  # range tolerance case
             self.range_tolerance = True
             self.inclusion = (
@@ -1930,6 +1936,20 @@ class NumericalResponse(LoncapaResponse):
                 if compare_with_tolerance(student_float, correct_float, expanded_tolerance):
                     is_correct = 'partially-correct'
 
+        # Reset self.additional_answer_index to -1 so that we always have a fresh index to look up.
+        self.additional_answer_index = -1
+
+        # Compare with additional answers.
+        if is_correct == 'incorrect':
+            temp_additional_answer_idx = 0
+            for additional_answer in self.additional_answers:
+                staff_answer = self.get_staff_ans(additional_answer)
+                if complex(student_float) == staff_answer:
+                    is_correct = 'correct'
+                    self.additional_answer_index = temp_additional_answer_idx
+                    break
+                temp_additional_answer_idx += 1
+
         if is_correct == 'partially-correct':
             return CorrectMap(self.answer_id, is_correct, npoints=partial_score)
         else:
@@ -1957,7 +1977,38 @@ class NumericalResponse(LoncapaResponse):
             return False
 
     def get_answers(self):
-        return {self.answer_id: self.correct_answer}
+        _ = self.capa_system.i18n.ugettext
+        # Example: "Answer: Answer_1 or Answer_2 or Answer_3".
+        separator = Text(' {b_start}{or_separator}{b_end} ').format(
+            # Translators: Separator used in NumericalResponse to display multiple answers.
+            or_separator=_('or'),
+            b_start=HTML('<b>'),
+            b_end=HTML('</b>'),
+        )
+        return {self.answer_id: separator.join([self.correct_answer] + self.additional_answers)}
+
+    def set_cmap_msg(self, student_answers, new_cmap, hint_type, hint_index):
+        """
+        Sets feedback to correct hint node in correct map.
+
+        Arguments:
+            student_answers (dict): Dict containing student input.
+            new_cmap (dict): Dict containing correct map properties.
+            hint_type (str): Hint type, either `correcthint` or `additional_answer`
+            hint_index (int): Index of the hint node
+        """
+        # Note: using self.id here, not the more typical self.answer_id
+        hint_nodes = self.xml.xpath('//numericalresponse[@id=$id]/' + hint_type, id=self.id)
+        if hint_nodes:
+            hint_node = hint_nodes[hint_index]
+            if hint_type == 'additional_answer':
+                hint_node = hint_nodes[hint_index].find('./correcthint')
+            new_cmap[self.answer_id]['msg'] += self.make_hint_div(
+                hint_node,
+                True,
+                [student_answers[self.answer_id]],
+                self.tags[0]
+            )
 
     def get_extended_hints(self, student_answers, new_cmap):
         """
@@ -1966,16 +2017,11 @@ class NumericalResponse(LoncapaResponse):
         """
         if self.answer_id in student_answers:
             if new_cmap.cmap[self.answer_id]['correctness'] == 'correct':  # if the grader liked the student's answer
-                # Note: using self.id here, not the more typical self.answer_id
-                hints = self.xml.xpath('//numericalresponse[@id=$id]/correcthint', id=self.id)
-                if hints:
-                    hint_node = hints[0]
-                    new_cmap[self.answer_id]['msg'] += self.make_hint_div(
-                        hint_node,
-                        True,
-                        [student_answers[self.answer_id]],
-                        self.tags[0]
-                    )
+                # Answer is not an additional answer.
+                if self.additional_answer_index == -1:
+                    self.set_cmap_msg(student_answers, new_cmap, 'correcthint', 0)
+                else:
+                    self.set_cmap_msg(student_answers, new_cmap, 'additional_answer', self.additional_answer_index)
 
 #-----------------------------------------------------------------------------
 
diff --git a/common/lib/capa/capa/tests/response_xml_factory.py b/common/lib/capa/capa/tests/response_xml_factory.py
index 9ded588c6c..076cba3315 100644
--- a/common/lib/capa/capa/tests/response_xml_factory.py
+++ b/common/lib/capa/capa/tests/response_xml_factory.py
@@ -204,6 +204,10 @@ class NumericalResponseXMLFactory(ResponseXMLFactory):
 
         *answer*: The correct answer (e.g. "5")
 
+        *correcthint*: The feedback describing correct answer.
+
+        *additional_answers*: A dict of additional answers along with their correcthint.
+
         *tolerance*: The tolerance within which a response
         is considered correct.  Can be a decimal (e.g. "0.01")
         or percentage (e.g. "2%")
@@ -219,6 +223,8 @@ class NumericalResponseXMLFactory(ResponseXMLFactory):
         """
 
         answer = kwargs.get('answer', None)
+        correcthint = kwargs.get('correcthint', '')
+        additional_answers = kwargs.get('additional_answers', {})
         tolerance = kwargs.get('tolerance', None)
         credit_type = kwargs.get('credit_type', None)
         partial_range = kwargs.get('partial_range', None)
@@ -232,6 +238,13 @@ class NumericalResponseXMLFactory(ResponseXMLFactory):
             else:
                 response_element.set('answer', str(answer))
 
+        for additional_answer, additional_correcthint in additional_answers.items():
+            additional_element = etree.SubElement(response_element, 'additional_answer')
+            additional_element.set('answer', str(additional_answer))
+            if additional_correcthint:
+                correcthint_element = etree.SubElement(additional_element, 'correcthint')
+                correcthint_element.text = str(additional_correcthint)
+
         if tolerance:
             responseparam_element = etree.SubElement(response_element, 'responseparam')
             responseparam_element.set('type', 'tolerance')
@@ -244,6 +257,10 @@ class NumericalResponseXMLFactory(ResponseXMLFactory):
             responseparam_element = etree.SubElement(response_element, 'responseparam')
             responseparam_element.set('partial_answers', partial_answers)
 
+        if correcthint:
+            correcthint_element = etree.SubElement(response_element, 'correcthint')
+            correcthint_element.text = str(correcthint)
+
         return response_element
 
     def create_input_element(self, **kwargs):
@@ -732,7 +749,7 @@ class StringResponseXMLFactory(ResponseXMLFactory):
 
             *regexp*: Whether the response is regexp
 
-            *additional_answers*: list of additional asnwers.
+            *additional_answers*: list of additional answers.
 
             *non_attribute_answers*: list of additional answers to be coded in the
                 non-attribute format
diff --git a/common/lib/capa/capa/tests/test_files/extended_hints_numeric_input.xml b/common/lib/capa/capa/tests/test_files/extended_hints_numeric_input.xml
index 6c074b0266..4c88c9ff3d 100644
--- a/common/lib/capa/capa/tests/test_files/extended_hints_numeric_input.xml
+++ b/common/lib/capa/capa/tests/test_files/extended_hints_numeric_input.xml
@@ -3,6 +3,9 @@
         <label>What value when squared is approximately equal to 2 (give your answer to 2 decimal places)?</label>
         <responseparam default=".01" type="tolerance"/>
         <formulaequationinput/>
+        <additional_answer answer="10">
+            <correcthint>This is an additional hint.</correcthint>
+        </additional_answer>
 
         <correcthint label="Nice">
             The square root of two turns up in the strangest places.
diff --git a/common/lib/capa/capa/tests/test_hint_functionality.py b/common/lib/capa/capa/tests/test_hint_functionality.py
index d890193a5a..5aaff6a2ed 100644
--- a/common/lib/capa/capa/tests/test_hint_functionality.py
+++ b/common/lib/capa/capa/tests/test_hint_functionality.py
@@ -236,6 +236,9 @@ class NumericInputHintsTest(HintTest):
     @data(
         {'problem_id': u'1_2_1', 'choice': '1.141',
          'expected_string': u'<div class="feedback-hint-correct"><div class="explanation-title">Answer</div><span class="hint-label">Nice </span><div class="hint-text">The square root of two turns up in the strangest places.</div></div>'},
+        # additional answer
+        {'problem_id': u'1_2_1', 'choice': '10',
+         'expected_string': u'<div class="feedback-hint-correct"><div class="explanation-title">Answer</div><span class="hint-label">Correct: </span><div class="hint-text">This is an additional hint.</div></div>'},
         {'problem_id': u'1_3_1', 'choice': '4',
          'expected_string': u'<div class="feedback-hint-correct"><div class="explanation-title">Answer</div><span class="hint-label">Correct: </span><div class="hint-text">Pretty easy, uh?.</div></div>'},
         # should get hint, when correct via numeric-tolerance
diff --git a/common/lib/capa/capa/tests/test_responsetypes.py b/common/lib/capa/capa/tests/test_responsetypes.py
index 0cf4cb8473..1f92b6f915 100644
--- a/common/lib/capa/capa/tests/test_responsetypes.py
+++ b/common/lib/capa/capa/tests/test_responsetypes.py
@@ -1390,7 +1390,7 @@ class NumericalResponseTest(ResponseTest):  # pylint: disable=missing-docstring
     # For simple things its not worth the effort.
     def test_grade_range_tolerance(self):
         problem_setup = [
-            # [given_asnwer, [list of correct responses], [list of incorrect responses]]
+            # [given_answer, [list of correct responses], [list of incorrect responses]]
             ['[5, 7)', ['5', '6', '6.999'], ['4.999', '7']],
             ['[1.6e-5, 1.9e24)', ['0.000016', '1.6*10^-5', '1.59e24'], ['1.59e-5', '1.9e24', '1.9*10^24']],
             ['[0, 1.6e-5]', ['1.6*10^-5'], ["2"]],
@@ -1400,6 +1400,54 @@ class NumericalResponseTest(ResponseTest):  # pylint: disable=missing-docstring
             problem = self.build_problem(answer=given_answer)
             self.assert_multiple_grade(problem, correct_responses, incorrect_responses)
 
+    def test_additional_answer_grading(self):
+        """
+        Test additional answers are graded correct with their associated correcthint.
+        """
+        primary_answer = '100'
+        primary_correcthint = 'primary feedback'
+        additional_answers = {
+            '1': '1. additional feedback',
+            '2': '2. additional feedback',
+            '4': '4. additional feedback',
+            '5': ''
+        }
+        problem = self.build_problem(
+            answer=primary_answer,
+            additional_answers=additional_answers,
+            correcthint=primary_correcthint
+        )
+
+        # Assert primary answer is graded correctly.
+        correct_map = problem.grade_answers({'1_2_1': primary_answer})
+        self.assertEqual(correct_map.get_correctness('1_2_1'), 'correct')
+        self.assertIn(primary_correcthint, correct_map.get_msg('1_2_1'))
+
+        # Assert additional answers are graded correct
+        for answer, correcthint in additional_answers.items():
+            correct_map = problem.grade_answers({'1_2_1': answer})
+            self.assertEqual(correct_map.get_correctness('1_2_1'), 'correct')
+            self.assertIn(correcthint, correct_map.get_msg('1_2_1'))
+
+    def test_additional_answer_get_score(self):
+        """
+        Test `get_score` is working for additional answers.
+        """
+        problem = self.build_problem(answer='100', additional_answers={'1': ''})
+        responder = problem.responders.values()[0]
+
+        # Check primary answer.
+        new_cmap = responder.get_score({'1_2_1': '100'})
+        self.assertEqual(new_cmap.get_correctness('1_2_1'), 'correct')
+
+        # Check additional answer.
+        new_cmap = responder.get_score({'1_2_1': '1'})
+        self.assertEqual(new_cmap.get_correctness('1_2_1'), 'correct')
+
+        # Check any wrong answer.
+        new_cmap = responder.get_score({'1_2_1': '2'})
+        self.assertEqual(new_cmap.get_correctness('1_2_1'), 'incorrect')
+
     def test_grade_range_tolerance_partial_credit(self):
         problem_setup = [
             # [given_answer,
diff --git a/common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee b/common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee
index 37c641494a..04e7044c7d 100644
--- a/common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee
+++ b/common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee
@@ -187,21 +187,80 @@ describe 'MarkdownEditingDescriptor', ->
 
 
         </problem>""")
-    it 'markup with multiple answers doesn\'t break numerical response', ->
+    it 'markup with additional answer does not break numerical response', ->
       data =  MarkdownEditingDescriptor.markdownToXml("""
         Enter 1 with a tolerance:
         = 1 +- .02
-        or= 2 +- 5%
+        or= 2
         """)
       expect(data).toXMLEqual("""<problem>
         <numericalresponse answer="1">
           <p>Enter 1 with a tolerance:</p>
-        <responseparam type="tolerance" default=".02"/>
+          <responseparam type="tolerance" default=".02"/>
+          <additional_answer answer="2"/>
           <formulaequationinput/>
         </numericalresponse>
 
+        </problem>"""
+      )
+    it 'markup for numerical with multiple additional answers renders correctly', ->
+      data =  MarkdownEditingDescriptor.markdownToXml("""
+        Enter 1 with a tolerance:
+        = 1 +- .02
+        or= 2
+        or= 3
+        """)
+      expect(data).toXMLEqual("""<problem>
+        <numericalresponse answer="1">
+          <p>Enter 1 with a tolerance:</p>
+          <responseparam type="tolerance" default=".02"/>
+          <additional_answer answer="2"/>
+          <additional_answer answer="3"/>
+          <formulaequationinput/>
+        </numericalresponse>
 
-        </problem>""")
+        </problem>"""
+      )
+    it 'Do not render ranged/tolerance/alphabetical additional answers for numerical response', ->
+      data =  MarkdownEditingDescriptor.markdownToXml("""
+        Enter 1 with a tolerance:
+        = 1 +- .02
+        or= 2
+        or= 3 +- 0.1
+        or= [4,6]
+        or= ABC
+        or= 7
+        """)
+      expect(data).toXMLEqual("""<problem>
+        <numericalresponse answer="1">
+          <p>Enter 1 with a tolerance:</p>
+          <responseparam type="tolerance" default=".02"/>
+          <additional_answer answer="2"/>
+          <additional_answer answer="7"/>
+          <formulaequationinput/>
+        </numericalresponse>
+
+        </problem>"""
+      )
+    it 'markup with feedback renders correctly in additional answer for numerical response', ->
+      data =  MarkdownEditingDescriptor.markdownToXml("""
+        Enter 1 with a tolerance:
+        = 100 +- .02 {{ main feedback }}
+        or= 10 {{ additional feedback }}
+        """)
+      expect(data).toXMLEqual("""<problem>
+        <numericalresponse answer="100">
+          <p>Enter 1 with a tolerance:</p>
+          <responseparam type="tolerance" default=".02"/>
+          <additional_answer answer="10">
+            <correcthint>additional feedback</correcthint>
+          </additional_answer>
+          <formulaequationinput/>
+          <correcthint>main feedback</correcthint>
+        </numericalresponse>
+
+        </problem>"""
+      )
     it 'converts multiple choice to xml', ->
       data = MarkdownEditingDescriptor.markdownToXml("""A multiple choice problem presents radio buttons for student input. Students can only select a single option presented. Multiple Choice questions have been the subject of many areas of research due to the early invention and adoption of bubble sheets.
 
diff --git a/common/lib/xmodule/xmodule/js/src/problem/edit.js b/common/lib/xmodule/xmodule/js/src/problem/edit.js
index 9c4c9cf082..b0d6922596 100644
--- a/common/lib/xmodule/xmodule/js/src/problem/edit.js
+++ b/common/lib/xmodule/xmodule/js/src/problem/edit.js
@@ -567,50 +567,108 @@
                     // Line split here, trim off leading xxx= in each function
                     var answersList = p.split('\n'),
 
-                        processNumericalResponse = function(val) {
-                            var params, answer, string, textHint, hintLine, value;
-                            // Numeric case is just a plain leading = with a single answer
-                            value = val.replace(/^\=\s*/, '');
+                        isRangeToleranceCase = function(answer) {
+                            return _.contains(
+                                ['[', '('], answer[0]) && _.contains([']', ')'], answer[answer.length - 1]
+                            );
+                        },
 
-                            textHint = extractHint(value);
-                            hintLine = '';
-                            if (textHint.hint) {
-                                value = textHint.nothint;
-                                hintLine = '  <correcthint' + textHint.labelassign + '>' + textHint.hint +
-                                    '</correcthint>\n';
+                        getAnswerData = function(answerValue) {
+                            var answerData = {},
+                                answerParams = /(.*?)\+\-\s*(.*?$)/.exec(answerValue);
+                            if (answerParams) {
+                                answerData.answer = answerParams[1].replace(/\s+/g, ''); // inputs like 5*2 +- 10
+                                answerData.default = answerParams[2];
+                            } else {
+                                answerData.answer = answerValue.replace(/\s+/g, ''); // inputs like 5*2
                             }
+                            return answerData;
+                        },
 
-                            if (_.contains(['[', '('], value[0]) && _.contains([']', ')'], value[value.length - 1])) {
-                                // [5, 7) or (5, 7), or (1.2345 * (2+3), 7*4 ]  - range tolerance case
-                                // = (5*2)*3 should not be used as range tolerance
-                                string = '<numericalresponse answer="' + value + '">\n';
-                                string += '  <formulaequationinput />\n';
-                                string += hintLine;
-                                string += '</numericalresponse>\n\n';
-                                return string;
-                            }
+                        processNumericalResponse = function(answerValues) {
+                            var firstAnswer, answerData, numericalResponseString, additionalAnswerString,
+                                textHint, hintLine, additionalTextHint, additionalHintLine, orMatch, hasTolerance;
 
-                            if (isNaN(parseFloat(value))) {
+                            // First string case is s?= [e.g. = 100]
+                            firstAnswer = answerValues[0].replace(/^\=\s*/, '');
+
+                            // If answer is not numerical
+                            if (isNaN(parseFloat(firstAnswer)) && !isRangeToleranceCase(firstAnswer)) {
                                 return false;
                             }
 
-                            // Tries to extract parameters from string like 'expr +- tolerance'
-                            params = /(.*?)\+\-\s*(.*?$)/.exec(value);
-
-                            if (params) {
-                                answer = params[1].replace(/\s+/g, ''); // support inputs like 5*2 +- 10
-                                string = '<numericalresponse answer="' + answer + '">\n';
-                                string += '  <responseparam type="tolerance" default="' + params[2] + '" />\n';
-                            } else {
-                                answer = value.replace(/\s+/g, ''); // support inputs like 5*2
-                                string = '<numericalresponse answer="' + answer + '">\n';
+                            textHint = extractHint(firstAnswer);
+                            hintLine = '';
+                            if (textHint.hint) {
+                                firstAnswer = textHint.nothint;
+                                // safe-lint: disable=javascript-concat-html
+                                hintLine = '  <correcthint' + textHint.labelassign + '>' +
+                                // safe-lint: disable=javascript-concat-html
+                                    textHint.hint + '</correcthint>\n';
                             }
 
-                            string += '  <formulaequationinput />\n';
-                            string += hintLine;
-                            string += '</numericalresponse>\n\n';
+                            // Range case
+                            if (isRangeToleranceCase(firstAnswer)) {
+                                // [5, 7) or (5, 7), or (1.2345 * (2+3), 7*4 ]  - range tolerance case
+                                // = (5*2)*3 should not be used as range tolerance
+                                // safe-lint: disable=javascript-concat-html
+                                numericalResponseString = '<numericalresponse answer="' + firstAnswer + '">\n';
+                            } else {
+                                answerData = getAnswerData(firstAnswer);
+                                // safe-lint: disable=javascript-concat-html
+                                numericalResponseString = '<numericalresponse answer="' + answerData.answer + '">\n';
+                                if (answerData.default) {
+                                    // safe-lint: disable=javascript-concat-html
+                                    numericalResponseString += '  <responseparam type="tolerance" default="' +
+                                    // safe-lint: disable=javascript-concat-html
+                                        answerData.default + '" />\n';
+                                }
+                            }
 
-                            return string;
+                            // Additional answer case or= [e.g. or= 10]
+                            // Since answerValues[0] is firstAnswer, so we will not include this in additional answers.
+                            additionalAnswerString = '';
+                            for (i = 1; i < answerValues.length; i++) {
+                                additionalHintLine = '';
+                                additionalTextHint = extractHint(answerValues[i]);
+                                orMatch = /^or\=\s*(.*)/.exec(additionalTextHint.nothint);
+                                if (orMatch) {
+                                    hasTolerance = /(.*?)\+\-\s*(.*?$)/.exec(orMatch[1]);
+                                    // Do not add additional_answer if additional answer is not numerical (eg. or= ABC)
+                                    // or contains range tolerance case (eg. or= (5,7)
+                                    // or has tolerance (eg. or= 10 +- 0.02)
+                                    if (isNaN(parseFloat(orMatch[1])) ||
+                                        isRangeToleranceCase(orMatch[1]) ||
+                                        hasTolerance) {
+                                        continue;
+                                    }
+
+                                    if (additionalTextHint.hint) {
+                                        // safe-lint: disable=javascript-concat-html
+                                        additionalHintLine = '<correcthint' +
+                                            // safe-lint: disable=javascript-concat-html
+                                            additionalTextHint.labelassign + '>' +
+                                            // safe-lint: disable=javascript-concat-html
+                                            additionalTextHint.hint + '</correcthint>';
+                                    }
+
+                                    // safe-lint: disable=javascript-concat-html
+                                    additionalAnswerString += '  <additional_answer answer="' + orMatch[1] + '">';
+                                    additionalAnswerString += additionalHintLine;
+                                    additionalAnswerString += '</additional_answer>\n';
+                                }
+                            }
+
+                            // Add additional answers string to numerical problem string.
+                            if (additionalAnswerString) {
+                                numericalResponseString += additionalAnswerString;
+                            }
+
+                            numericalResponseString += '  <formulaequationinput />\n';
+                            numericalResponseString += hintLine;
+                            numericalResponseString += '</numericalresponse>\n\n';
+
+                            return numericalResponseString;
                         },
 
                         processStringResponse = function(values) {
@@ -657,7 +715,7 @@
                             return string;
                         };
 
-                    return processNumericalResponse(answersList[0]) || processStringResponse(answersList);
+                    return processNumericalResponse(answersList) || processStringResponse(answersList);
                 });