There's an infinite list of them.
The smallest one is 144.
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0.5625
9
1.7778
1.7778
This is subtraction of fractions. Hence 9/16 - 9/20 => [9(20) - 9(16)] / (16 x 20) [180 - 144] / 320 [36] /320 Cancel down by '4' 9/80 The answer ; this will not reduce any further.