Multiplying
Estimate
Add/Subtract Decimals
Rounding
100
22 X 5 =
110
100
265 + 211 =
300 + 200 = 500
100
4.5 + 1.2
5.7
100
Round to the nearest hundreds : 467
500
200
56 X 7
392
200
489 + 721 =
500 + 700 =1,200
200
4.67 + 22.3
26.97
200
Round to the nearest hundreds 3,411
3,400
300
34 X 81
2,754
300
1,789 + 3,421 =
2,000 + 3,000 = 5,000
300
79.8 - 45.9
33.9
300
Round to the nearest ten thousands : 24,523
20,000
400
234 X 5
1,170
400
298 + 501 + 999 =
300 + 500 + 1,000 = 1,800
400
678.89 - 45.6
633.29
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