Subtract 42/24 from 1/28, Solve 1/28

Subtract 42/24 from 1/28

1^st number: 1/28, 2^nd number: 1 18/24

1/28 - 42/24 is -12/7.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 24 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 28 × 6 = 168,
1/28 = 1 × 6/28 × 6 = 6/168
Likewise, for the 2nd fraction, since 24 × 7 = 168,
42/24 = 42 × 7/24 × 7 = 294/168
Subtract the two like fractions:
6/168 - 294/168 = 6 - 294/168 = -288/168
After reducing the fraction, the answer is -12/7

MathStep (Works offline)

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