Estimate the following product using general rule:
578 x 161

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Solution

Rule : Round off each factor to its greatest place (nearest hundred), then multiply the rounded off factors.

578 can be rounded off to 600 (nearest hundred)
161 can be rounded off to 200 (nearest hundred)
Therefore, the estimated product of 578 x 161 = 600 x 200 = 1,20,000.

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Question 3(a)

Estimate the following product using general rule:
578 x 161

Estimate the following products using general rule:

(a) 578 × 161 (b) 5281 × 3491

(i) 578 \times 161

(ii) 1291 \times 592

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