Basic Mathematics for College Students

Apply the associative property of addition to find the sum.

See Example 4.

45. (9 3)  7


46. (7 9)  1


47. (13 8)  12


48. (19 7)  13


49. 94 (6 37)


50. 92 (8 88)


51. 125 (75 41)


52. 240 + (60 + 93)

Use the commutative and associative properties of addition to

find the sum.See Example 5.

53. 4  8  16  1  1


54. 2  1  28  3  6


55. 23  5  7  15  10


56. 31  6  9  14  20


57. 
    

58.

59.

60.

Use front-end rounding to estimate the sum.See Example 6.

61. 686  789 12,233 24,500 5,768


62. 404  389 11,802 36,902 7,777


63. 567,897 23,943 309,900 99,113


64. 822,365 15,444 302,417 99,010

Find the perimeter of each rectangle or square.See Example 9.

65. 
    
    
    
    66. 
        
    
    
    
    


66. 
    
    
    
    68. 5 yards (yd)
    
    
    
    

5 yd

17 inches (in.)

17 in.

127 meters (m)

91 m

32 feet (ft)

12 ft

562  99  848

457  97  653

4 9 5

7 6

 8 3 5

6 2 4

9 0 5

 8 6

69. 
    
    
    
    70. 
        
    
    
    
    

71.

72.

Add.

73.

74.

75.

76.

77.

78.

79.

80.

81. 16,427 increased by 13,573


82. 13,567 more than 18,788

83.

84.

85.

86.

87. 12  1  8  4  9  16


88. 7  15  13  9  5  11

2,3794,7792,339

3,1561,5786,578

8 7

 5 6

7 6

 4 5

4 2 3

 5 7 0

6 3 2

 3 4 7

7 (6323)

(4516) 4

4,68973,422 26  433

51,246 578  37 4,599

5 , 7 9 9

 6 , 8 7 9

8 , 5 3 9

 7 , 3 6 8

TRY IT YOURSELF

77 in. (inches)

76 in.

87 cm (centimeters)

6 cm

56 ft (feet)

56 ft

94 mi (miles)

94 mi

26 Chapter 1 Whole Numbers