Subtract 90/15 from 9/40, Solve 9/40

Subtract 90/15 from 9/40

1^st number: 9/40, 2^nd number: 6 0/15

9/40 - 90/15 is -231/40.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 40 × 3 = 120,
9/40 = 9 × 3/40 × 3 = 27/120
Likewise, for the 2nd fraction, since 15 × 8 = 120,
90/15 = 90 × 8/15 × 8 = 720/120
Subtract the two like fractions:
27/120 - 720/120 = 27 - 720/120 = -693/120
After reducing the fraction, the answer is -231/40

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