HW#4 Review: Decimals

Adding/subtracting decimals

100

33.3 + 12.4

45.7

200

(-6.4)+(-4.16)

-10.56

300

6.7-(-5.5)

12.2

400

(-1.6)+4.99

3.39

500

Mr. Becker drove 11.3 km to the dentist, 7.5 km to the library, and 5.8 km back home. How far did he travel?

24.6 km

Rounding and Scientific Notation

100

Round the decimal to the tenths place

4.5789

4.6

200

Round the decimal to the hundredths place

34.485

34.49

300

Write in standard notation:

6.25 x 10⁷

62500000

400

Write in scientific notation

0.00000000439

4.39 x 10^-9

500

Round to the thousandths place

10.1497

10.150

Multiplying Decimals

100

6 x 2.4

14.4

200

-3.7 x -6

22.2

300

-5.1 x 1.3

-6.63

400

-4.8 x 0.3

-1.44

500

-9.35 x -8.68

81.158

Dividing Decimals

100

17 divided by 0.1

170

200

4.5 divided by -0.3

-15

300

7.3 divided by 2

3.65

400

-6.1 divided by 5

-1.22

500

-8.1 divided by -0.4

20.25

How many are there?

100

How many colors are there in a rainbow?

7

200

How many years are in a century?

100

300

How many squares are there on a chess board?

64

400

How many sides does a pentagon have?

5

500

How many keys does a piano have?

88