Unit 2 Decimals Review

Place Value

100

What number is in the tens place?

176.456

7

200

What is the place value of the underlined digit?

1,234.78

tenths

300

Name the place value of the underlined digit.

234.129

Thousandths

400

What is the value of the underlined digit?

2,487

400

500

What is the value of the underlined digit?

1.257

5/100

Comparing Decimals

100

Compare the two numbers below

4.2        4.1

4.2 > 4.1

200

Compare the numbers below

4.024           4.24

4.024< 4.24

300

Compare the decimals below

245.124             245.184

Explain Why

245.124<245.184

The 8 in the hundredths place is larger than the 2 in the hundredths place

400

Order the decimals from least to greatest.

15.32, 17.34, 15.289, 16.8, 15.9

15.289,15.32, 15.9, 16.8, 17.34

500

Order the following decimals from least to greatest

123.4, 12.4, 1234.0, 12.34, and 12.43

12.34, 12.4, 12.43, 123.4, 1234.0

Rounding Decimals

100

Round the following decimal to the nearest whole number

14.67

Why?

15

Six tenths is closer to the whole number 15

200

Round to the nearest whole number 

29.89

Why

30

Eight tenths would round the number up, but after 9 is 10, so you need to go to the next place value. 30 is the number after 29

300

Round the number to the nearest tenth

3.41

3.4

400

Round to the nearest hundredth

2.567

2.57

500

Round to the nearest hundred

245.123

200

Expanded Form/Word Form

100

Write 1.2 in word form

One and two tenths

200

Write 2.45 in word form

Two and forty five hundredths

300

Write 123.245

One hundred twenty three and two hundred forty five thousandths

400

Write the following number in expanded form

2.34

2 x 1 + 3 x 1/10 + 4 x 1/100

500

Write the following number in expanded form

123.345

1 x 100 + 2 x 10 + 3 x 1 + 3 x 1/10 + 4 x 1/100 + 5x 1/1000

Powers of 10

100

Explain the relationship between the value of the 6 in both numbers. Use multiples or powers of 10 in your explanation. 

2.36   and 2.63

The 6 in 2.36 is 1/10 the size of the 6 in 2.63

200

Explain the relationship between the 9 in the numbers below using the power of 10.

2942 and 2090

The 9 in 2942 is ten times bigger than the 9 in 2090

300

Explain the relationship between the value of the 3 in both numbers below

12.3 and 3.21

The 3 in 12.3 is 1/100 the size of the 3 in the number 3.21

400

Explain the relationship between the value of the 7 in the numbers below.

271.21 and 231.72

271.21 the seven is 100 times larger than the 7 in 231.72

500

Explain the relationship between the value of the 1 in each number

2341 and 1234

The 1 in 2341 is 1/1000 the value of the 1 in 1234