Subtract 42/16 from 20/49, Solve 20/49

Subtract 42/16 from 20/49

1^st number: 20/49, 2^nd number: 2 10/16

20/49 - 42/16 is -869/392.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 16 is 784

Next, find the equivalent fraction of both fractional numbers with denominator 784
For the 1st fraction, since 49 × 16 = 784,
20/49 = 20 × 16/49 × 16 = 320/784
Likewise, for the 2nd fraction, since 16 × 49 = 784,
42/16 = 42 × 49/16 × 49 = 2058/784
Subtract the two like fractions:
320/784 - 2058/784 = 320 - 2058/784 = -1738/784
After reducing the fraction, the answer is -869/392

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