Title: Lesson 5-7
Author: mark_cameron
Last saved by: gtsmith
Company: McGraw-Hill

Lesson 4-8

Example 1 Write Fractions as Decimals
Write  as a decimal.

Since 5 is a factor of 10, write an equivalent fraction with a denominator of 10.

×2

 = 	Since 5 × 2 = 10, multiply the numerator and denominator by 2.

×2

	
	= 0.8	Read 0.8 as eight tenths.

Example 2 Write Fractions as Decimals
Write  as a decimal.

Since 25 is a factor of 100, write an equivalent fraction with a denominator of 100.

×4

 = 	Since 25 × 4 = 100, multiply the numerator and denominator by 4.

×4

	
	= 0.32	Read 0.32 as thirty-two hundredths.

Example 3 Fractions as Decimals
Write  as a decimal.

METHOD 1 Use paper and pencil.

Place the decimal point directly above the decimal point after 5.

  0.625

  →  8  5.000	

To divide 5 by 8, place a decimal point after 5 and annex as many zeros as necessary to complete the division.

           − 48
                20
            −  16
                  40
               − 40
                    0

METHOD 2 Use a calculator.

5 ÷ 8 ENTER  0.625

Therefore,  = 0.625.

Example 4 Mixed Numbers as Decimals
RAINFALL   Suppose it rained a total of 2 inches yesterday. Write this amount as a decimal.

Since 4 × 25 = 100, multiply the numerator and the denominator by 25.

2 = 2 + 	Definition of a mixed number.
	= 2 + 
	= 2 + 0.25 or 2.25	Read 2.25 as two and twenty-five hundredths.

The amount of rainfall yesterday was 2.25 inches.

Check Use a calculator. 2 + 1 ÷ 4 ENTER 2.25