Basic Mathematics for College Students

11. Fill in the blanks to rewrite each subtraction as addition
    of the opposite of the number being subtracted.
    a.
    b.
    c.


12. Fill in the blanks to complete the estimation.

NOTATION

13. Copy the following addition problem. Insert a
    decimal point and additional zeros so that the
    number of decimal places in the addends match.


14. Refer to the subtraction problem below. Fill in the
    blanks: To subtract in the column, we
    borrow 1 tenth in the form of 10 hundredths from
    the 3 in the column.

GUIDED PRACTICE

Add.See Objective 1.

15. 
    
    
    
    16. 
        
    
    
    
    


16. 
    
    
    
    18. 
        
    
    
    
    

Add.See Example 1.

19.

20.

21.

22.

Subtract.See Objective 2.

23. 
    
    
    
    24. 
        
    
    
    
    


24. 
    
    
    
    26. 
        
    
    
    
    

Subtract.See Example 2.

27. 
    
    
    
    28. 977.6
         345.8
    
    
    
    

495.4

 153.7

7.56

 2.33

8.97

 6.22

9.47

 5.06

6.83

 3.52

52.7639.1 128 11.84

27.4716.4 157 12.12

46.2285.6 39 19.37

36.8217.3 42 15.44

2.11

5.04

 2.72

3.04

4.12

 1.43

16.3

 3.5

32.5

 7.4

29.3

2

1

11

 25. 1 6

46.6

11

 15.702

Round to the nearest ten.

 Round to the nearest ten.

567.7

 214.3

782.0

5.17.45.1()

29.03(13.55)29.03

6.81.26.8()

29. 
    
    
    
    30. 
        
    
    
    
    

Perform the indicated operation.See Example 3.

31. Subtract 11.065 from 18.3.


32. Subtract 15.041 from 17.8.


33. Subtract 23.037 from 66.9.


34. Subtract 31.089 from 75.6.
    Add.See Example 4.


35. 
    
    
    
    36. 
        
    
    
    
    


36. 
    
    
    
    38. Add.See Example 5.
    
    
    
    


37. 
    
    
    
    40. 
        
    
    
    
    


38. 
    
    
    
    42. Subtract.See Example 6.
    
    
    
    


39. 
    
    
    
    44. 
        
    
    
    
    


40. 
    
    
    
    46. Subtract.See Example 7.
    
    
    
    


41. 
    
    
    
    48. 
        
    
    
    
    


42. 
    
    
    
    50. Evaluate each expression.See Example 8.
    
    
    
    


43. 
    


44. 
    


45. 
    


46. 
    

    Estimate each sum by rounding the addends to the nearest ten.
    See Example 9.

    
    


47. 
    
    
    
    56. Estimate each difference by using front-end rounding.
        See Example 9.
    
    
    
    


48. 
    
    
    
    58. 
        
    
    
    
    

TRY IT YOURSELF

Perform the indicated operations.

59. 
    
    
    
    60. 
        
    
    
    
    


60. 
    
    
    
    62. 
        
    
    
    
    


61. 
    
    
    
    64. 
        
    
    
    
    


62. 
    
    
    
    66. 
        
    
    
    
    

67.

68.

69.

70.

71. Subtract 23.81 from 24.

505.0103 23 0.98912.0704

645 9.900050.123.02002

143.3(64.01)

30.03(17.88)

19.05

 31.95

21.88

 33.12

46.09(7.8) 34.7(30.1)

9.57.1 7.0814.3

45.634.7 19.042.4

671.0188.35 447.2336.16

510.65279.19 424.08169.04

15.5(19.85.7)

16.4(18.95.9)

12.3(13.67.9)

11.1(14.47.8)

6.78(24.6) 8.51(27.4)

4.49(11.3) 5.76(13.6)

42.52.8 93.23.9

62.83.9 56.18.6

6.45(12.6) 8.81(14.9)

4.12(18.8) 7.24(19.7)

9.5(9.3) 7.3(5.4)

6.3(8.4) 9.2(6.7)

767.2

 614.7

878.1

 174.6

340 Chapter 4 Decimals