Question 57

Solve the following 

$$113 \times 87 = ?$$

Solution

$$113 \times 87 = ?$$

$$(100 + 13) \times (100 - 13) = ?$$

$$(a + b)(a - b) = a^2 - b^2$$

$$(100)^2 - (13)^2 = ?$$

? = 10000 - 169 = 9831


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