Adding and Subtracting Fractions With Negatives

Adding and Subtracting Fractions With Negatives

​Use the same rules as integers.

Multiple Choice

  Addition Same Sign:  Add and keep the sign

-4 + (-3) =

• 12

• -12

• 7

• -7

Multiple Choice

Addition Different Signs: Ignore signs, do biggest minus smallest, then keep the sign of the bigger number. 

2 + (-6)

• 8

• -8

• 4

• -4

Multiple Choice

Subtraction: KEEP CHANGE CHANGE!

Keep first sign, change to addition, change the sign of the second number. Then use addition rules.

-5 - 7

• 12

• -12

• 2

• -2

​Negative Fractions

• ​Use the same rules, but now with fractions!

• ​Do your common denominators and conversions first.

• ​Rewrite the problem after you have your common denominators!

• ​Once you are done check the original problem to make sure your answer makes sense!

​Math Sprint! Solve as many as you can in 3 minutes

​-1/2 + (-2/3)

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​-5/6 + 1/4

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​3/4 + (-5/6)

​

​1/2 - (-2/5)

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​-3/7 - (-1/2)

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​-1/3 - (- 2/6)

​Math Sprint! Review your answers

​-1/2 + (-2/3) = -1 2/3

​

​-5/6 + 1/4 = -7/12

​

​3/4 + (-5/6) = -1/12

​

​1/2 - (-2/5) = 9/10

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​-3/7 - (-1/2) = 1/14

​

​-1/3 - (- 2/6) = 0

Multiple Choice

Solve and Simplify

-1/4 - (-2/3)

• -5/12

• 5/12

• -11/12

• 11/12

​Finished!

​Great work! Keep practicing and remember to do your homework.

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​Always remember to simplify!