Subtract 15/72 from 10/90
10/90 - 15/72 is -7/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
10/90 = 10 × 4/90 × 4 = 40/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
15/72 = 15 × 5/72 × 5 = 75/360 - Subtract the two like fractions:
40/360 - 75/360 = 40 - 75/360 = -35/360 - After reducing the fraction, the answer is -7/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/90-15/72 10/90-30/72 30/90-15/72 10/90-45/72 50/90-15/72 10/90-75/72 70/90-15/72