7th Grade Math

= Step-by-Step Solutions begin on page R1.

Extra Practice begins on page EP2.

Examples 1–5 Add or subtract. Write in simplest form.

99 ^45 + ^35 10. 75 + 76 11. ^38 + (^) (- ^78 ) 12. - ^19 + (- ^59 )

13. 
    
    
    
    • 65 + (- ^56 ) 14. - _^15
      16
      
      
      • (- _^7
        16
      
      
      
      
    
    
    
    

(^) ) 15. _^9
10

• ^3
  10
  16. ^58 - _^38

17. _^5
    14

• (- _^1
  14

(^) ) 18. - 95 - 92 19. _^7
12

• ^2
  12
  20. ^15
  18
  
  
  • _^13
    18
  
  
  
  

Example 6 2121 GRADES In Mr. Navarro’s first period class, _ 2817 of the students got an A

on their math test. In his second period class, _^1128 of the students got an A.

What fraction more of the students got an A in Mr. Navarro’s first period

class than in his second period class? Write in simplest form.

22. COOKING A recipe for Michigan blueberry pancakes calls for ^34 cup
    flour, ^14 cup milk, and _^14 cup blueberries. How much more flour is needed
    than milk? Write in simplest form.


23. INSTANT MESSENGER The table shows Instant Messenger Abbreviations
    L8R (Later) _ 10048

LOL (Laughing out loud) _ 10026

BRB (Be right back) _ 10019

CUL8R (See you later) _ 1007

the Instant Messenger abbreviations

students at Hillside Middle School

use the most.

a. What fraction of these students uses

LOL or CUL8R when using Instant

Messenger?

b. What fraction of these students uses L8R

or BRB when using Instant Messenger?

Use the order of operations to add or subtract. Write in simplest form.

B 24. 54 + ^15 + ^35 25. ^78 + (^) (- ^58 ) - 81 26. _^13
14

• _^5
  14
  
  
  • _^6
    14
  
  
  
  

27. 32 + ^23 + 32 28. ^4
    15

• (- _^9
  15

(^) ) + _^1
15

29. ^57 - ^37 + _^67


30. VOLCANOES The graph shows

4PVUI

"NFSJDB





/PSUI

"NFSJDB





&VSPQF





Worldwide Volcano Eruptions

"TJB
BOE

4PVUI
1BDJGJD





the location of volcanic

eruptions. What fraction

represents the volcanic

eruptions for both North and

South America? How much

larger is the section for Asia

and South Pacific than for

Europe? Write in simplest form.

3131 MEASUREMENT How much

longer than _ 165 inch is _^1316 inch?

32. MEASUREMENT What is the total
    of 1 ^34 cups and ^34 cup in simplest form?

142 Rational Numbers

139_156_C3L2_895130.indd 142 12/31/09 12:37 PM