Subtract 21/7 from 1/36, Solve 1/36

Subtract 21/7 from 1/36

1^st number: 1/36, 2^nd number: 3 0/7

1/36 - 21/7 is -107/36.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 7 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 36 × 7 = 252,
1/36 = 1 × 7/36 × 7 = 7/252
Likewise, for the 2nd fraction, since 7 × 36 = 252,
21/7 = 21 × 36/7 × 36 = 756/252
Subtract the two like fractions:
7/252 - 756/252 = 7 - 756/252 = -749/252
After reducing the fraction, the answer is -107/36

MathStep (Works offline)

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