EXERCISE 1 F
QUESTION 1
Estimate first, then write the sum or difference. Find the sum to check your work.
(i) 51 + 47
Sol :
(ii) 528 + 62
Sol :
(iii) 2314 + 372
Sol :
(iv) 1521 + 6325
Sol :
(v) 43278 + 2902
Sol :
(vi) 7893 - 4164
Sol :
(vii) 47348 - 2267
Sol :
(viii) 2597 - 390
Sol :
(ix) 9001 - 557
Sol :
(x) 65662 - 4465
Sol :
QUESTION 2
Choose the correct answer for each of these. Rounding off will help you
(i) 167 + 2051 + 1356 = (1835 , 3015 , 5085)
Sol :
(ii) 6995 - 3068 = (3927 , 1927 , 2927)
Sol :
(iii) 2008 × 3 = (5048 , 4048 , 6024)
Sol :
(iv) 5898 ÷ 3 = (1966 , 1066 , 2966)
Sol :
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