Subtract 40/63 from 42/40, Solve 1 2/40

Subtract 40/63 from 42/40

1^st number: 1 2/40, 2^nd number: 40/63

42/40 - 40/63 is 523/1260.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 63 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 40 × 63 = 2520,
42/40 = 42 × 63/40 × 63 = 2646/2520
Likewise, for the 2nd fraction, since 63 × 40 = 2520,
40/63 = 40 × 40/63 × 40 = 1600/2520
Subtract the two like fractions:
2646/2520 - 1600/2520 = 2646 - 1600/2520 = 1046/2520
After reducing the fraction, the answer is 523/1260

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