Unit 3 Math Review

Writing in Expanded Form and Number Names

100

Write the number in number name form:

3.12

Three and twelve hundredths

200

Write the number in number name form:

7.148

Seven and one hundred forty-eight thousandths

300

Write the number in expanded form:

2.055

(2 x 1) + (5 x 0.01) + (5 x 0.001)

400

Write the number in expanded form:

10.01

(1 x 10) + (1 x 0.01)

500

Write the number in expanded form:

6.327

(6 x 1) + (3 x 0.1) + (2 x 0.01) + (7 x 0.001)

Comparing Decimals

100

Compare the two numbers with < , =, or >

2.991  ______  2.919

2.991  >  2.919

200

Compare the two numbers with < , =, or >

2.020 ____ 2.200

2.020 < 2.200

300

Compare the two numbers using <, =, >

0.192 ____ 0.291

0.192 < 0.291

400

Compare the two numbers using <, =, >

0.020 ____ 0.02

0.020 = 0.02

500

Compare the two numbers using <, =, >

0.809 ____ 0.80

0.809 > 0.80

Rounding

100

Round the number to the nearest 1

2.787

3

200

Round the number to the nearest 1

0.308

0

300

Round the number to the nearest tenth

32.398

32.4

400

Round the number to the nearest tenth

7.099

7.1

500

Round the number to the nearest hundredth

25.699

25.70

Adding and Subtracting Decimals

100

Find the sum.

34.345 + 76.456 =

110.801

200

Find the sum.

3.467 + 10.64 =

14.107

300

Find the difference.

6.364 - 2.568 =

3.796

400

Find the difference.

12.1 - 9.887 =

2.213

500

Find the difference.

7.0 - 4.139 = 

2.861

Multiplying/Dividing by powers of 10

100

2.25 x 100 =

225

200

8.565 x 10 = 

85.65

300

98.25 / 10

9.825

400

0.74 / 10

0.074

500

92.273 x 1,000

92,273