Ch 5 Fractions

LCM

100

What is the LCM of 7 and 21?

21

200

What is the LCM of 4 and 9

36

300

What is the LCM of 15 and 21? 

105

400

What is the LCM of 3, 6, and 8? 

24

500

What is the LCM of 8, 10, and 15? 

120

Add Fractions

100

What do fractions have to have in common to add them? 

common denominators

200

4/9 + 7/18

answer must be in simplest form

5/6

300

3/4 + 7/18

must answer in simplest form

41/36 or 1 5/36

400

3 5/6 + 2 7/9

answer must be in simplified form

6 11/18

500

Bob ate 4 1/2 mini pizzas for lunch and 3 1/3 mini pizzas for supper. How many mini pizzas did he eat in total? 

7 5/6 mini pizzas

Subtract Fractions

100

How would you regroup the number 13 to subtract it by 5 2/7? 

12 7/7

200

10/11 - 1/2

answer in simplest form

9/22

300

7 2/3 - 5 2/5

must answer in simplest form

2 4/15

400

6 2/9 - 3 7/9

must answer in simplest form

2 4/9

500

Bob has 10 5/8 cups of chocolate chips. He uses 2 1/6 cups of chocolate chips to make cookies. How many chocolate chips does he have left? 

8 11/24 cups

Multiply Fractions

100

4 x 5/8

must answer in simplest form

5/2

200

7/10 x 15/16

must answer in simplest form

21/32

300

2 1/3 x 1 2/5

answer in simplest form

49/15

400

9 1/3 x 2 1/7

answer in simplest form

20

500

Bob ran 2 2/3 miles on Monday, Wednesday, and Friday. How many miles did he run in total? 

8 miles

Divide Fractions

100

Which fraction do you flip when dividing fractions? 

the 2nd one! 

200

15/16 ÷ 5

answer in simplest form

3/16

300

8/35 ÷ 32/45

answer in simplest form

9/28

400

4 2/7 ÷ 2 1/2

answer in simplest form

12/7

500

Bob has 4 2/3 pizzas leftover from a party. If he and 6 friends share the remaining pizza, how much will each person get? 

2/3 of a pizza