Subtract 90/5 from 81/60
1st number: 1 21/60, 2nd number: 18 0/5
81/60 - 90/5 is -333/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 5 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 60 × 1 = 60,
81/60 = 81 × 1/60 × 1 = 81/60 - Likewise, for the 2nd fraction, since 5 × 12 = 60,
90/5 = 90 × 12/5 × 12 = 1080/60 - Subtract the two like fractions:
81/60 - 1080/60 = 81 - 1080/60 = -999/60 - After reducing the fraction, the answer is -333/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/60-90/10 81/60-90/15 81/60-90/25 81/60-90/35