Question

estimate first and then name the sum or difference. use your estimate to check your work (i) 1314 +272 (ii) 1512 +4325 (iii) 33278+1902 (iv) 9893 - 5164

Answer 1

Answer with explanation:

1. 1314 +272

Actual sum = 1586

If Estimated by ten's=1590

If Estimated by hundred's=1600

Estimation using Ten's

1310+270=1580

Estimation using Hundred's

1300+300=1600

2.1512 +4325

Actual sum = 5837

If Estimated by ten's=5840

If Estimated by hundred's=5800

Estimation using Ten's

1510+4330=5840

Estimation using Hundred's

1500+4300=5800

3. 33278+1902

Actual sum =35180

If Estimated by ten's=35180

If Estimated by hundred's=35200

Estimation using Ten's

33280+1900=35180

Estimation using Hundred's

33300+1900=35200

4. 9893 -5164

Actual difference =4729

If Estimated by ten's=4730

If Estimated by hundred's=4700

Estimation using Ten's

9890-5160= 4730

Estimation using Hundred's

9900 - 5200= 4700

Answer 2

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