Subtract 63/14 from 18/72, Solve 18/72

Subtract 63/14 from 18/72

1^st number: 18/72, 2^nd number: 4 7/14

18/72 - 63/14 is -17/4.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 14 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504
Likewise, for the 2nd fraction, since 14 × 36 = 504,
63/14 = 63 × 36/14 × 36 = 2268/504
Subtract the two like fractions:
126/504 - 2268/504 = 126 - 2268/504 = -2142/504
After reducing the fraction, the answer is -17/4

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