Fractions (Adding and subtracting w/ and w/o common denominators)

Adding (common denominator)

100

1/4 + 2/4

3/4

200

3/7 + 2/7

5/7

300

1/12 + 5/12

6/12

400

7/17 + 5/17

12/17

500

8/19 + 6/19

14/19

Subtracting (Common denominator)

100

9/15 - 5/15

4/15

200

4/19 - 2/19

2/19

300

7/28 - 2/28

5/28

400

17/57 - 14/57

3/57

500

23/65 - 12/65

11/65

Adding (uncommon denominator)

100

1/2 + 1/4

3/4

200

2/3 + 1/6

5/6

300

2/5 + 6/15

12/15

400

3/8 + 5/24

14/24

500

1/7 + 5/21

8/21

Subtracting (uncommon denominator)

100

1/4 - 1/8

1/8

200

2/3 - 1/6

3/6

300

4/5 - 7/15

5/15

400

7/9 - 5/18

9/18

500

9/10 - 14/30

13/30

Word Problems

100

Michael eats 3/8 of a pie on Monday. He eats 2/8 of the pie on Tuesday. How much of the pie did he eat? How much is left.

He ate 5/8. There is 3/8 left. 

200

Sara eats 2/10 of her chocolate bar. If she gives 3/10 of her chocolate bar to her friend, how much will she have left?

5/10

300

Nadia has 20 pens. She lends 3 pens to her friend, and 4 ran out of ink. How many pens does she have left? 

13//20

400

Sean eats 4/7 of his birthday cake. How much of his birthday cake did he not eat?

3/7

500

Talia invited 9 people to her birthday party. 2 were unable to attend. What is the fraction of invited guests who were able to attend her birthday party?

7/9