Subtract 30/63 from 1/20, Solve 1/20

Subtract 30/63 from 1/20

1/20 - 30/63 is -179/420.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 63 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 20 × 63 = 1260,
1/20 = 1 × 63/20 × 63 = 63/1260
Likewise, for the 2nd fraction, since 63 × 20 = 1260,
30/63 = 30 × 20/63 × 20 = 600/1260
Subtract the two like fractions:
63/1260 - 600/1260 = 63 - 600/1260 = -537/1260
After reducing the fraction, the answer is -179/420

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