Subtract 90/30 from 9/15
1st number: 9/15, 2nd number: 3 0/30
9/15 - 90/30 is -12/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
9/15 = 9 × 2/15 × 2 = 18/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
90/30 = 90 × 1/30 × 1 = 90/30 - Subtract the two like fractions:
18/30 - 90/30 = 18 - 90/30 = -72/30 - After reducing the fraction, the answer is -12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15-90/30 9/30-90/30 9/15-90/60 27/15-90/30 9/45-90/30 45/15-90/30 9/75-90/30 63/15-90/30