9 ÷ 4 - 1 = 1.25
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You work it backwards. Start with 9 -- the final result -- then subtract 1, multiply by 4, subtract 8, and divide by 2.
4 1/2 divided by 9 is 1/2 or 0.5
1
Anything divided by itself is 1.
4/9 divided by 1/2 = 0.8888 repeating.