Subtract 48/12 from 18/40, Solve 18/40

Subtract 48/12 from 18/40

1^st number: 18/40, 2^nd number: 4 0/12

18/40 - 48/12 is -71/20.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 40 × 3 = 120,
18/40 = 18 × 3/40 × 3 = 54/120
Likewise, for the 2nd fraction, since 12 × 10 = 120,
48/12 = 48 × 10/12 × 10 = 480/120
Subtract the two like fractions:
54/120 - 480/120 = 54 - 480/120 = -426/120
After reducing the fraction, the answer is -71/20

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