Question

Make four more such examples.
3. Estimate the following products using general rule . (a)9250 x 29 . Give explanation.​

Answer 1

Answer:

Example 1.

⇒  578 x 161

Rounding off 578 to the nearest hundreds, we get 600

And, rounding off 161 to the nearest hundreds, we get 200

Therefore, 600 x 200 = 1,20,000

It means that estimate of 578 x 161 is equal to 1,20,000 according to the general rule.

Example 2.

⇒ 5281 × 3491

Rounding off 5,291 to the nearest thousands, we get 5,000

And, rounding off 3,491 to the nearest hundreds, we get 3,500

Therefore, 5,000 x 3,500 = 1,75,00,000

It means that estimate of 5281 x 3491 is equal to 1,75,00,000 according to the general rule.

Example 3.

⇒ 1291 × 592

Rounding off 1291 to the nearest hundreds we get, 1300

And, rounding off 592 to the nearest hundreds, we get 600

Therefore, 1300 x 600 = 7,80,000

It means that estimate of 1291 x 592 is equal to 7,80,000 according to the general rule.

Example 4.

⇒ 9250 × 29

Rounding off 9250 to the nearest thousands, we get 9000

And, rounding off 29 to the nearest tens, we get 30

Therefore, 9000 x 30 = 2,70,000

It means that estimate of 9250 × 29 is equal to 2,70,000 using general rule.

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