Subtract 90/20 from 9/15
1st number: 9/15, 2nd number: 4 10/20
9/15 - 90/20 is -39/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
9/15 = 9 × 4/15 × 4 = 36/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
90/20 = 90 × 3/20 × 3 = 270/60 - Subtract the two like fractions:
36/60 - 270/60 = 36 - 270/60 = -234/60 - After reducing the fraction, the answer is -39/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15-90/20 9/30-90/20 9/15-90/40 27/15-90/20 9/45-90/20 9/15-90/60 45/15-90/20 9/75-90/20 63/15-90/20