\[12\times \frac{48}{4}\]

1
Use this rule: a×bc=abca \times \frac{b}{c}=\frac{ab}{c}.
12×484\frac{12\times 48}{4}

2
Simplify  12×4812\times 48  to  576576.
5764\frac{576}{4}

3
Simplify.
144144

Done

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