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Adding Decimals
Expanded Form
Rounding Decimals
Estimating Sums
& Differences
Subtracting Decimals
100

1.1 + 1.2

2.3

100

37.2

3x10 + 7x1 + 2 x 1/10

100
Round the decimal to the given place-value. 5.031; hundredths
What is 5.03
100

Estimate using rounding. 38.2 + 11.8

What is 38 + 12 = 51

100

Subtract the decimals   5.9 - 3.4

What is 2.5

200
34.2 + 10.7
44.9
200

435.23

4x100 + 3x10 + 5x1 + 2x 1/10 + 2x 1/100

200

Round the decimal to the given place-value. 36.8; whole number

What is 37

200

Estimate. 75.3 + 22.1

What is 75 + 22 = 97

200

Subtract the decimals 6.45 - 0.72

What is 5.73

300

27.40 + 3.5

30.90

300

72.07

7x10 + 2x1 + 7x 1/100

300
Round the decimal to the given place-value. 27.35; tens
What is 27
300

Estimate 31.9 + 58.3

What is 32 + 58 = 90

300

Subtract the Decimals 1.32 - 0.08

1.24

400
32.35 + 29.9
62.25
400

97.38

9x10 + 7x1 + 3x 1/10 + 8x 1/100

400

Round the decimal to the given place-value. 3.455; hundredths

What is 3.46

400

Estimate 12.0 - 11.8

0

400

Subtract the decimals 148.93 - 121.36

What is 27.57

500

24 + 1.45

25.45

500

785.02

7x100 + 8x10 + 5x1 + 2x 1/100

500

Round the decimal to the given place-value. 2.059; tenth

What is 2.1

500

Estimate. 6.4 + 5.8 + 5.6 + 6.0

What is 6 + 6 + 6 + 6 = 24

500

Subtract the decimals   248 - 131.4

What is 116.6