Subtract 12/72 from 28/7, Solve 4 0/7

Subtract 12/72 from 28/7

1^st number: 4 0/7, 2^nd number: 12/72

28/7 - 12/72 is 23/6.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 72 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 7 × 72 = 504,
28/7 = 28 × 72/7 × 72 = 2016/504
Likewise, for the 2nd fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504
Subtract the two like fractions:
2016/504 - 84/504 = 2016 - 84/504 = 1932/504
After reducing the fraction, the answer is 23/6
In mixed form: 35/6

MathStep (Works offline)

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