Subtract 49/42 from 6/20, Solve 6/20

Subtract 49/42 from 6/20

1^st number: 6/20, 2^nd number: 1 7/42

6/20 - 49/42 is -13/15.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
6/20 = 6 × 21/20 × 21 = 126/420
Likewise, for the 2nd fraction, since 42 × 10 = 420,
49/42 = 49 × 10/42 × 10 = 490/420
Subtract the two like fractions:
126/420 - 490/420 = 126 - 490/420 = -364/420
After reducing the fraction, the answer is -13/15

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