Subtract 5/72 from 90/10, Solve 9 0/10

Subtract 5/72 from 90/10

1^st number: 9 0/10, 2^nd number: 5/72

90/10 - 5/72 is 643/72.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 72 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 10 × 36 = 360,
90/10 = 90 × 36/10 × 36 = 3240/360
Likewise, for the 2nd fraction, since 72 × 5 = 360,
5/72 = 5 × 5/72 × 5 = 25/360
Subtract the two like fractions:
3240/360 - 25/360 = 3240 - 25/360 = 3215/360
After reducing the fraction, the answer is 643/72
In mixed form: 867/72

MathStep (Works offline)

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