Subtract 10/18 from 72/10, Solve 7 2/10

Subtract 10/18 from 72/10

1^st number: 7 2/10, 2^nd number: 10/18

72/10 - 10/18 is 299/45.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 18 is 90

Next, find the equivalent fraction of both fractional numbers with denominator 90
For the 1st fraction, since 10 × 9 = 90,
72/10 = 72 × 9/10 × 9 = 648/90
Likewise, for the 2nd fraction, since 18 × 5 = 90,
10/18 = 10 × 5/18 × 5 = 50/90
Subtract the two like fractions:
648/90 - 50/90 = 648 - 50/90 = 598/90
After reducing the fraction, the answer is 299/45
In mixed form: 629/45

MathStep (Works offline)

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