Subtract 15/63 from 28/7, Solve 4 0/7

Subtract 15/63 from 28/7

1^st number: 4 0/7, 2^nd number: 15/63

28/7 - 15/63 is 79/21.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 63 is 63

Next, find the equivalent fraction of both fractional numbers with denominator 63
For the 1st fraction, since 7 × 9 = 63,
28/7 = 28 × 9/7 × 9 = 252/63
Likewise, for the 2nd fraction, since 63 × 1 = 63,
15/63 = 15 × 1/63 × 1 = 15/63
Subtract the two like fractions:
252/63 - 15/63 = 252 - 15/63 = 237/63
After reducing the fraction, the answer is 79/21
In mixed form: 316/21

MathStep (Works offline)

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