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Q.3 Estimate the following products using general rule:
(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