# Estimate the foll

(a) 578×161

Rounding off by general rule,

578 rounds off to 600

161 rounds off to 200,

So,

= 600×200 = 120000

(b) 5281×3491

Rounding off by the general rule,

5281 rounds off to 5000

3491 rounds off to 3500

So,

= 5000×3500

= 17500000

(c) 1291×592

Rounding off by general rule,

1291 rounds off to 1300

592 rounds off to 600

So,

= 1300×600

= 780000

(d) 9250×29

Rounding off by general rule,

9250 rounds off to 9000

29 rounds off to 30

So,

= 9000 × 30

= 27000

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