Estimate each of the following products by rounding off each number to the nearest ten:
28 × 63

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Solution

28 estimated to the nearest ten = 30
63 estimated to the nearest ten = 60
∴ The required estimation = (30 $\times$ 60) = 1800

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Estimate each of the following products by rounding off each number to nearest tens.

(a) 87 x 32

(b) 311 x 113

(d) 1385 x 789

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