Subtract 9/5 from 8/72, Solve 8/72

Subtract 9/5 from 8/72

1^st number: 8/72, 2^nd number: 1 4/5

8/72 - 9/5 is -76/45.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 5 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 72 × 5 = 360,
8/72 = 8 × 5/72 × 5 = 40/360
Likewise, for the 2nd fraction, since 5 × 72 = 360,
9/5 = 9 × 72/5 × 72 = 648/360
Subtract the two like fractions:
40/360 - 648/360 = 40 - 648/360 = -608/360
After reducing the fraction, the answer is -76/45

MathStep (Works offline)

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