Basic Mathematics for College Students

120 Chapter 1 Whole Numbers

Multiply.

45. 
    
    
    
    46. 
        
    
    
    
    


46. 
    
    
    
    48. 
        
    
    
    
    


47. 
    
    
    
    50. 
        
    
    
    
    


48. 
    
    
    
    52. 
        
    
    
    
    


49. Estimate the product:


50. Write the repeated addition
    as a multiplication.


51. Find each product:
    a. b.


52. What property of multiplication is shown?
    a.
    b.

Find the area of the rectangle and the square.

57.

4 cm

8 cm

100(50)50(100)

2 (57)(25) 7

8  0 7  1

7  7  7  7  7

6,891 438

5,624 502  459

 281

3,723

 46

157  59

72 10,000 110(400)

47  9 5 (76)

58.

59. SLEEP The National Sleep Foundation
    recommends that adults get from 7 to 9 hours of
    sleep each night.
    a. How many hours of sleep is that in one year
    using the smaller number? (Use a 365-day
    year.)
    b. How many hours of sleep is that in one year
    using the larger number?


60. GRADUATION For a graduation ceremony, the
    graduates were assembled in a rectangular 22-row
    and 15-column formation. How many members are
    in the graduating class?


61. PAYCHECKS Sarah worked 12 hours at $9 per
    hour, and Santiago worked 14 hours at $8 per hour.
    Who earned more money?


62. SHOPPING There are 12 eggs in one dozen, and
    12 dozen in one gross. How many eggs are in a
    shipment of 100 gross?

78 in.

78 in.

REVIEW EXERCISES

SECTION 1.5 Dividing Whole Numbers

To divide whole numbers,think of separating

a quantity into equal-sized groups.

To write division, we can use a division

symbol a long division symbol or a

fraction bar^.

,  ,

DEFINITIONS AND CONCEPTS EXAMPLES

Dividend Divisor

Quotient

8

2

 4

4

8  2  4 2  8

Another way to answer a division problem is

to think in terms of multiplication and write a

related multiplication statement.

8  2  4 because 4  2  8

A process called long division can be used

to divide whole numbers. Follow a four-step

process:

• Estimate


• Multiply


• Subtract


• Bring down

Divide:

Quotient

Divisor

361 R 14

(^23) 8,317
 69
141
 138
37
 23
14



8,317 23

 





Dividend

Remainder