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(a) 578 × 161

(b) 5281 × 3491

(c) 1291 × 592

(d) 9250 × 29

Make four more such examples.

Answer :

(a) 578 × 161

Rounding off by general rule

578 and 161 rounded off to 600 and 200 respectively

600×200= 120000

(b) 5281 × 3491

Rounding off by general rule

5281 and 3491 rounded off to 5000 and 3500 respectively

5000 × 3500 = 17500000

(c) 1291 × 592

Rounding off by general rule

1291 and 592 rounded off to 1300 and 600 respectively

1300 × 600 = 780000

(d) 9250 × 29

Rounding off by general rule

9250 and 29 rounded off to 9000 and 30 respectively

9000 × 30 = 270000
Four more examples are as follows

(a) 178 × 351

Rounding off by general rule

178 and 351 rounded off to 200 and 400 respectively

200×400= 80000

(b) 5571 × 871

Rounding off by general rule

5571 and 871 rounded off to 6000 and 900 respectively

6000 × 900 = 5400000

(c) 181 × 92

Rounding off by general rule

181 and 92 rounded off to 200 and 90 respectively

200 × 90 =18000

(d) 4150 × 69

Rounding off by general rule

4150 and 69 rounded off to 4000 and 70 respectively

4000 × 70 = 280000

- Q.1 Estimate each of the following using general rule: (a) 730 + 998 (b) 796 – 314 (c) 12904 + 2888 (d) 28292 – 21496 Make ten more such examples of addition, subtraction and estimation of their outcome.
- Q.2 Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens): (a) 439 + 334 + 4317 (b) 108734 – 47599 (c) 8325 – 491 (d) 489348 – 48365 Make four more such examples.

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