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

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

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

What is the most important question you ask before adding or subtracting fractions? If no. Then what?

Are the denominators the same? If no we need to find a common denominator by listing multiples. 

Fraction Word Problems

100

At lunchtime, a cafeteria served a total of 1/2 of a pot of chicken soup and 7/8 of a pot of onion soup. How many pots of soup were served in all?

11/8 or 1 3/8

200

Mrs. Stephenson baked apple pies for her family. The boys ate 3/4 of a pie and the girls ate 1/12 of a pie. How much more pie did the boys eat than the girls?

8/12 simplified 2/3

300

Joel and Brad made cornfields in Minecraft. Joel harvested 5/6 of an acre of corn on Monday and Brad harvested 7/12 of an acre. How many acres did Joel and Brad harvest together?

17/12 simplified 1 5/12

400

At the farmers' market, Billy bought 2/3 of a pound of string beans and 4/5 of a pound of lima beans. How many pounds of beans did Billy buy?

22/15 = 1 7/15

500

Felix began his pizza delivery route with 3/4 of a tank of gas in his car. When he made it back to the pizzeria, 5/7 of a tank of gas was left. How much gas did Felix use?

6/28 = 3/14