Question 3(a)

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 x 161
578 round off to nearest hundred $\Rightarrow$ 600
161 round off to nearest hundred $\Rightarrow$ 200
$∴$ The estimated product = 600 x 200 = 1,20,000

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Question 3(a)

Estimate the following product using general rule:
578 x 161

(i) 578 \times 161

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Estimate the following products using general rule:

(a) 578 × 161 (b) 5281 × 3491

Question 3(b)

Estimate the following product using general rule:
5281 x 3491

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