\[1200\times \frac{5}{8}\]

1
Use this rule: a×bc=abca \times \frac{b}{c}=\frac{ab}{c}.
1200×58\frac{1200\times 5}{8}

2
Simplify  1200×51200\times 5  to  60006000.
60008\frac{6000}{8}

3
Simplify.
750750

Done

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