7th Grade Math

Examples 1–4 Multiply. Write in simplest form.

1. ^2
   3
   × ^1
   3
   2. - 2 × ^2
   5
   3. ^1
   6
   × 4


2. 
   
   
   
   • ^1
     4
     × (- ^8
     9
   
   
   
   

(^) ) 5. 2 ^1
4
× ^2
3

6. 
   
   
   
   • 1 ^5
     6
     × (- 3 ^3
     5
   
   
   
   

(^) )
Examples 5 and 6 7. WEIGHT The weight of an object on Mars is about _^2
5
its weight on Earth.
How much would an 80-pound dog weigh on Mars?
= Step-by-Step Solutions begin on page R1.
Extra Practice begins on page EP2.
Examples 1–4 Multiply. Write in simplest form.

8. ^3
   4
   × ^1
   8
   9. ^2
   5
   × ^2
   3
   10. - 9 × ^1
   2
   11. ^4
   5
   × (- 6 )


9. 
   
   
   
   • ^1
     5
     × (- ^5
     6
   
   
   
   

(^) ) 13. - ^4
9
× (- ^1
4
(^) ) 14. ^2
3
× ^1
4

15. 
    

    ^1
    12
    × ^3
    5

    
    


16. 
    

    ^4
    7
    × ^7
    8
    1717 ^2
    5
    × ^15
    16

    
    


17. 
    

    (^) (- 1 ^1
    2
    (^) ) × ^2
    3

    
    


18. 
    

    3 ^1
    3
    × (- ^1
    5

    
    

(^) )
Examples 5 and 6 20. DVDs Each DVD storage case is about _^1
5
inch thick. What will be the
height in simplest form of 12 cases sold together?

21. PIZZA Mark left ^3
    8
    of a pizza in the refrigerator. On Friday, he ate ^1
    2
    of what
    was left of the pizza. What fraction of the entire pizza did he eat on Friday?


22. MEASUREMENT The width of a vegetable garden is ^1
    3
    times its length. If the
    length of the garden is 7 ^3
    4
    feet, what is the width in simplest form?


23. RECIPES A recipe to make one batch of blueberry muffins calls for 4 _^2
    3
    cups
    of flour. How many cups of flour are needed to make 3 batches of
    blueberry muffins? Write in simplest form.

Multiply. Write in simplest form.

B 24. - 14 × 1 _^1

7

25. 3 ^3
    4
    × 8 26. 9 × 4 ^2
    3
    27. 4 × _^75
    6


26. 
    
    
    
    • 3 ^1
      4
      × (- 2 ^2
      3
    
    
    
    

(^) ) 29. (^) ( ^1
4
(^) )
2
30. (^) ( ^3
10
(^) )
4
31. (^) (- _^2
3
(^) )
3

32. MEASUREMENT The width of the fish
    tank is _^2
    5
    of its length. What is the width
    of the fish tank in simplest form?


33. BICYCLING Philip rode his bicycle at 9 ^2
    5
    miles
    per hour. If he rode for ^34 of an hour, how many
    miles in simplest form did he cover?

Lesson 3B Multiply and Divide Fractions 163

158_165_C3L3_895130.indd 163 12/31/09 12:41 PM