Question
Simplify each of the following: $12 \times 105$

Answer

$12 \times 105 = (10 + 2) \times 105$
$= 10 \times 105 + 2 \times 105$
$= 10 \times (100 + 5) + 2 \times (100 + 5)$
$= 1000 + 50 + 200 + 10$
$= 1260$

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