7th Grade Math

Reinforcement

of GLE 0606.2.1

Understand and explain

the procedures for

multiplication and division

of fractions, mixed

numbers, and decimals.

Reinforcement of

SPI 0606.2.3 Solve

problems involving the

addition, subtraction,

multiplication, and division

of decimals. Also

addresses GLE 0606.2.2.

10 Start Smart

World Championships

In the Berlin World

Championship, Usain Bolt beat

his Beijing Olympic times in

the 100-meter and 200-meter

events, with times of 9.58 and

19.19 seconds, respectively.

SPORTS Jamaican sprinter Usain Bolt ran 200 meters in 19.3 seconds at

the Summer Olympics in Beijing. What was his speed in meters per

second?

To find Bolt’s average speed, divide 200 meters by 19.3 seconds.

Dividing decimals is similar to dividing whole numbers.

Divide a Decimal by a Whole Number

Find 25.8 ÷ 2. Estimate 26 ÷ 2 = 13

12.9 Place the decimal directly above the decimal point in the dividend.

2  25.8 Divide as with whole numbers.

• 2
  5


• 4
  18


• 18
  0 Check by Multiplying 12.9 × 2 = 25.8 

a. 8.7 ÷ 3 b. 613.8 ÷ 66

Division

Dividend → 25.8

Divisor → 2

Quotient → 12.9

002_021_C00_SS_895130.indd 10 1/4/10 2:22 PM