Multiply $10.5$ and $9.5$

99.75

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99.85

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99.95

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97.08

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Solution

The correct option is A 99.75
$10.5 \times 9.5$
$= (10 + 0.5) (10 - 0.5)$
Using ,
$(a - b) (a + b) = a^{2} - b^{2}$ we get,
$= 10^{2} - {0.5}^{2}$
$= 100 - 0.25$
$= 99.75$

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