Subtract 90/72 from 15/60
1st number: 15/60, 2nd number: 1 18/72
15/60 - 90/72 is -1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 60 × 6 = 360,
15/60 = 15 × 6/60 × 6 = 90/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Subtract the two like fractions:
90/360 - 450/360 = 90 - 450/360 = -360/360 - After reducing the fraction, the answer is -1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60-90/72 45/60-90/72 75/60-90/72