Subtract 20/16 from 1/7, Solve 1/7 - 1 4/16 as a fraction

Subtract 20/16 from 1/7

1^st number: 1/7, 2^nd number: 1 4/16

1/7 - 20/16 is -31/28.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 16 is 112

Next, find the equivalent fraction of both fractional numbers with denominator 112
For the 1st fraction, since 7 × 16 = 112,
1/7 = 1 × 16/7 × 16 = 16/112
Likewise, for the 2nd fraction, since 16 × 7 = 112,
20/16 = 20 × 7/16 × 7 = 140/112
Subtract the two like fractions:
16/112 - 140/112 = 16 - 140/112 = -124/112
After reducing the fraction, the answer is -31/28

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad