Subtract 42/63 from 9/40, Solve 9/40

Subtract 42/63 from 9/40

9/40 - 42/63 is -53/120.

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,
9/40 = 9 × 63/40 × 63 = 567/2520
Likewise, for the 2nd fraction, since 63 × 40 = 2520,
42/63 = 42 × 40/63 × 40 = 1680/2520
Subtract the two like fractions:
567/2520 - 1680/2520 = 567 - 1680/2520 = -1113/2520
After reducing the fraction, the answer is -53/120

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