2. Round off to the nearest ten :
(i) 243 (ii) 42
(iv) 3252 (v) 3456 (ui) 25
3. Round off to the nearest hundred :
(i) 375 (ii) 42753 (ii) 2473 (iv) 35789 (v) 256 (vi) 49
4. Round off to the nearest thousand :
(1) 425 (i) 6780 (ii) 23675 (iv) 2475 (v) 128967 (vi) 24823
5. Estimate the following:
(1) 243 + 4272 (ii) 145 + 2478 (ii) 1248 - 167 (iv) 8465 - 1234
(v) 243 + 1252 (vi) 2431 + 142 (vii) 243 + 178 (viii) 4217-398
6. Estimate the following:
(1) 42 x 127 (ii) 128 x 780 (iii) 24 x 425 (iv) 7 x 471
7. Estimate the following:
(i) 295 + 15 (ii) 1254 + 10 (iii) 4295 + 7 (iv) 1215 + 11
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Answer:
2. (i) 240 (ii) 40(iv) 3250 (v) 3460 (vi) 30
3. ( i) 400 (ii) 42800 (iii) 2500 (iv) 35800 ( v) 300 (vi) 50
4 .( i) 500 (ii) 6800 (iii) 23700 (iv) 2000 (v) 129000(vi) 25000
5(i) 4515 (ii) 2623 (iii) 1081 (iv) 7231 (v) 1495 (vi) 2573
(vii) 3819
6. (i) 5334 ( ii) 99840
(iii) 10200 (iv) 3297
7.(i) 310 (ii) 1264 (iii) 4302 (iv) 1226
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