Middle School Adding & Subtracting Fractions

Adding & Subtracting Fractions with Like Denominators

100

1/6 + 4/6

5/6

200

3/4 - 1/4

1/2

300

9/10 - 7/10

1/5

400

2/12 + 4/12

1/2

500

2/15 + 1/15

1/5

Adding & Subtracting Fractions with Unlike Denominators

100

1/4 + 5/8

7/8

200

2/5 + 1/2

9/10

300

7/12 - 1/2

1/12

400

5/6 - 2/12

3/4

500

3/12 - 1/8

1/8

Adding Mixed Numbers with like Denominators

100

4 1/6 + 9 1/6

13 2/6

200

8 1/2 + 8 1/2

16 2/2=1 so 17

300

8 1/2 + 4 1/2

12 2/2=13

400

8 1/12 + 2 1/12

10 2/12 or 10 1/6

500

10 10/12 + 8 2/12

18 and 12/12= 18+1= 19

Vocabulary for Working with Fractions

100

Answers must be ___________. (Hint: This is the last step you should always complete when working with fractions.)

Simplified

Exonerated

Maintained

Simplified

200

12/7 is an example of an _______________. This is not in the simplest form!

improper fraction

mixed number

impossible number

improper fraction

300

Fractions must have the same _________ before adding or subtracting. (Hint: This is the 1st step when adding or subtracting fractions)

denominator

procastinator

Numerator

denominator

400

Use __________ fractions after finding the LCM or common denominator before adding or subtracting. (Hint: This is the 2nd step when adding or subtracting fractions)

equivalent (For example, think about the fraction 1/2. It means half of something. You can also say that 6/12 is half, and that 50/100 is half)

Improper numbers

Scooby Doo

equivalent

500

Fraction of boys in the class.

Fraction of girls in the class.

What is boys 4/9  girls 5/9