Subtract 3/84 from 7/20, Solve 7/20

Subtract 3/84 from 7/20

7/20 - 3/84 is 11/35.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420
Subtract the two like fractions:
147/420 - 15/420 = 147 - 15/420 = 132/420
After reducing the fraction, the answer is 11/35

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