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Merge pull request freeCodeCamp#17 from bgroveben/beginner_math
Beginner Math Challenges added to challenge directory. Not added to challenges.json yet.
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‎challenges/4.1.Addition/lesson.md

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## Python Addition
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In Python, an integer (int) is one of 3 distinct numeric types.
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- https://docs.python.org/3.6/library/stdtypes.html#numeric-types-int-float-complex
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In this exercise, you will add two integers using the plus (+) operator.
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- https://docs.python.org/3.6/library/operator.html#operator.add
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- https://docs.python.org/3/library/operator.html#mapping-operators-to-functions
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```
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>>> 2 + 2
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4
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```
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**_Instructions:_**
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**Change the 0 so that total will equal 20.**

‎challenges/4.1.Addition/lesson_code.py

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### Modify the code below ###
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total = 10 + 0
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### Modify the code above ###
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print(total)

‎challenges/4.1.Addition/lesson_tests.py

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import unittest
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import lesson_code
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class AdditionTests(unittest.TestCase):
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def test_main(self):
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total = lesson_code.total
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self.assertIsInstance(total, int)
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self.assertEqual(total, 20)
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# To run the tests from the console:
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# Make sure that you are in the '4.1.Addition' directory
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# ⇒ python3 -m unittest lesson_tests

‎challenges/4.2.Subtraction/lesson.md

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## Python Subtraction
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In Python, an integer (int) is one of 3 distinct numeric types.
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- https://docs.python.org/3.6/library/stdtypes.html#numeric-types-int-float-complex
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In this exercise, you will subtract two integers using the minus (-) operator.
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- https://docs.python.org/3.6/library/operator.html#operator.sub
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- https://docs.python.org/3/library/operator.html#mapping-operators-to-functions
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```
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>>> 4 - 2
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2
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```
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**_Instructions:_**
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**Change the 0 so that total will equal 10.**

‎challenges/4.2.Subtraction/lesson_code.py

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### Modify the code below ###
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total = 20 - 0
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### Modify the code above ###
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print(total)

‎challenges/4.2.Subtraction/lesson_tests.py

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import unittest
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import lesson_code
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class SubtractionTests(unittest.TestCase):
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def test_main(self):
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total = lesson_code.total
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self.assertIsInstance(total, int)
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self.assertEqual(total, 10)
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# To run the tests from the console:
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# Make sure that you are in the '4.2.Subtraction' directory
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# ⇒ python3 -m unittest lesson_tests

‎challenges/4.3.Multiplication/lesson.md

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## Python Multiplication
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Python uses the asterisk (\*) operator for multiplication.
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If any or all of the numbers being multiplied are floating point numbers, then the product will be a float.
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- https://docs.python.org/3/library/operator.html#operator.mul
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- https://docs.python.org/3/library/operator.html#mapping-operators-to-functions
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- https://docs.python.org/3/library/stdtypes.html#numeric-types-int-float-complex
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```
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>>> 3 * 3
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9
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>>> 4.0 * 4
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16.0
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```
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**_Instructions:_**
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**Change the 0 so that product will equal 80.**

‎challenges/4.3.Multiplication/lesson_code.py

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### Modify the code below ###
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product = 8 * 0
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### Modify the code above ###
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print(product)

‎challenges/4.3.Multiply/lesson_settings.json renamed to ‎challenges/4.3.Multiplication/lesson_settings.json

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‎challenges/4.3.Multiplication/lesson_tests.py

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import unittest
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import lesson_code
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class MultiplicationTests(unittest.TestCase):
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def test_main(self):
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product = lesson_code.product
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self.assertIsInstance(product, int)
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self.assertEqual(product, 80)

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