Subtract 90/15 from 20/8
1st number: 2 4/8, 2nd number: 6 0/15
20/8 - 90/15 is -7/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
20/8 = 20 × 15/8 × 15 = 300/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
90/15 = 90 × 8/15 × 8 = 720/120 - Subtract the two like fractions:
300/120 - 720/120 = 300 - 720/120 = -420/120 - After reducing the fraction, the answer is -7/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/8-90/15 20/16-90/15 20/8-90/30 60/8-90/15 20/24-90/15 20/8-90/45 20/40-90/15 20/8-90/75 20/56-90/15