The correct option is B 7221 8 3 8 7 ___________ 8x(8+1) / 3x7 72 / 21 ⇒ 7221 Since the numbers are of the form wh ...

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Determination of Significant Digits in a Number

83 × 87=?

Question

$83 \times 87 = ?$

7221

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7331

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7321

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7231

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Solution

The correct option is A 7221
8 3
8 7
___________
8x(8+1) / 3x7
72 / 21 $\Rightarrow 7221$

Since the numbers are of the form where the sum of the unit's digits is 10 and the remaining digits are the same.
1. Multiply the unit's digits. $\Rightarrow 3 x 7 = 21$ .
2. Multiply the remaining digit with 1 more than itself, i.e. multiply 8 with (8 + 1). $\Rightarrow 8 \times (8 + 1) = 72$ .

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