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

1.1 + 1.02

2.03

100

34.25

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

100
Round the decimal to the given place-value. 5.031; hundredths
What is 5.03
100
Estimate using rounding. 38.23 + 11.84
What is 38 + 12 = 51
100
Subtract the decimals 5.9 - 3.4
What is 2.5
200

304.933 + 4.07

309.003

200

.5034

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

200
Round the decimal to the given place-value. 0.00092; thousandths
What is 0.001
200
Estimate. 75.38 + 22.04
What is 75. + 22 = 97
200
Subtract the decimals 6.458 - 0.724
What is 5.734
300
99.999 + 99.999
199.998
300

45.2403

4x10 + 5x1 + 2x 1/10 + 4x 1/100 + 3x 1/10,000

300
Round the decimal to the given place-value. 27.35; tens
What is 27
300
Estimate 31.29 + 58.07
What is 31. + 58 = 89
300
Subtract the Decimals 1.325 - 0.081
1.244
400

305 + 45.002

350.002

400

2000.26457

2x 1000 + 2x 1/10 + 6x 1/100 + 4x 1/1,000 + 5x 1/10,000 + 7x 1/ 100,000

400
Round the decimal to the given place-value. 3.4553; thousandths
What is 3.455
400
Estimate 12.045 - 11.81
0
400
Subtract the decimals 148.93 - 121.36
What is 27.57
500
Add Decimals 24 + 1.456
25.456
500

9,000,004.0006

9x1,000,000 + 4x1 + 6x 1/10,000

500
Round the decimal to the given place-value. 2.059; hundredths
What is 2.06
500
Estimate. 6.45 + 5.88 + 5.61 + 6.03
What is 6 + 6 + 6 + 6 = 24
500
Subtract the decimals 248 - 131.48
What is 116.72
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