Q6 of 59 Page 162

Use appropriate formulae and compute:

107 × 93

107 × 93 = (100 + 7)(100 – 7)


We use (a + b)(a - b) = a2 - b2


⇒ 107 × 93 = 1002-72


⇒ 107 × 93 = 10000-49


⇒ 107 × 93 = 9951


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