Subtract 72/63 from 84/40, Solve 2 4/40

Subtract 72/63 from 84/40

1^st number: 2 4/40, 2^nd number: 1 9/63

84/40 - 72/63 is 67/70.

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,
84/40 = 84 × 63/40 × 63 = 5292/2520
Likewise, for the 2nd fraction, since 63 × 40 = 2520,
72/63 = 72 × 40/63 × 40 = 2880/2520
Subtract the two like fractions:
5292/2520 - 2880/2520 = 5292 - 2880/2520 = 2412/2520
After reducing the fraction, the answer is 67/70

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