Basic Mathematics for College Students

Chapter 4 Summary and Review 401

Multiply.

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    50. 
        
    
    
    
    


48. 
    
    
    
    52. Evaluate each expression.
    
    
    
    


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    54. 
        
    
    
    
    


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53. 
    


54. Write each number in standard notation.
    a. GEOGRAPHY China is the third largest
    country in land area with territory that extends
    over 9.6 millionsquare kilometers. (Source:
    china.org)
    b. PLANTING TREES In 2008, the Chinese
    people planted 2.31 billiontrees in mountains,
    city parks, and along highways to increase the
    number of forests in their country. (Source:
    xinhuanet.com)


55. a. Estimate the product using front-end rounding:

b. Estimate the product by rounding the factors to

the nearest tenth:12.427.38

193.287.63

(0.1)^3  20 45.6312.24 0

(3.3)^2 (0.00001)

3(7.8)2(1.1)^2

(0.60.7)^2 (3)(4.1)

(0.2)^2 (0.15)^2

1,000(90.1452) 0.001(2.897)

15.5(9.8) (0.003)(0.02)

275

 8.4

1.7

 0.004

2.36.9 32.45(6.1)

61. Evaluate the formula for ,
    , and.


62. SHOPPING If crab meat sells for $12.95 per
    pound, what would 1.5 pounds of crab meat cost?
    Round to the nearest cent.


63. AUTO PAINTING A manufacturer uses a three-
    part process to finish the exterior of the cars it
    produces.
    Step 1: A 0.03-inch-thick rust-prevention
    undercoat is applied.
    Step 2: Three layers of color coat, each 0.015 inch
    thick, are sprayed on.
    Step 3: The finish is then buffed down, losing 0.005
    inch of its thickness.
    What is the resulting thickness of the automobile’s
    finish?


64. WORD PROCESSORS The Page Setup screen for
    a word processor is shown. Find the area that can be
    filled with text on an 8.5 in. 11 in. piece of paper if
    the margins are set as shown.

1.0 in.

0.6 in.

0.5 in.

0.7 in.

Top

Bottom

Left

Right

Margins

Margins Preview

Help Ok Cancel

Page Setup



r0.08 t 5

APPrt P70.05

REVIEW EXERCISES

SECTION 4.4 Dividing Decimals

To divide a decimal by a whole number:

1.Write the problem in long division form and

place a decimal point in the quotient (answer)

directly above the decimal point in the

dividend.

2.Divide as if working with whole numbers.

3.If necessary, additional zeros can be written to

the right of the last digit of the dividend to

continue the division.

DEFINITIONS AND CONCEPTS EXAMPLES

Divide:

Place a decimal point in the quotient that lines

up with the decimal point in the dividend.

Ignore the decimal points and divide as if

working with whole numbers.

Write a zero to the right of the 2 and bring

it down. Continue to divide.

The remainder is 0.

1.55

4 6.2 0

 4

22

 20

20

 20

0

6.2 4