Question
$(-23) \times (42) = (-42) \times $_____.
✓
Answer
$(-23) \times (42) = (-1) \times (23) \times (42) = (-1) \times (42) \times (23)$
$[\because$ multiplication is commutative, i.e. $a \times b = b \times a] = (-42) \times (23)$
$[\because$ multiplication is commutative, i.e. $a \times b = b \times a] = (-42) \times (23)$
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