Estimate 111 x 36 by rounding off both the number to the nearest tens, before multiplication.

5,460

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4,000

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4,400

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3,600

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Solution

The correct option is C 4,400
Rouding off to the nearest tens:

In 111, it is closer to 110 than 120,

Thus, 111 is rounded off to 110.

Similarly, 36 is closer to 40 than 30,
Thus, 36 is rounded off to 40.

The multiplication after rouding off to the nearest tens is:
110 x 40 = (11 x 4) x 100
= 44 x 100
= 4,400

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