Subtract 20/90 from 12/15
12/15 - 20/90 is 26/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
12/15 = 12 × 6/15 × 6 = 72/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
72/90 - 20/90 = 72 - 20/90 = 52/90 - After reducing the fraction, the answer is 26/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-20/90 12/15-40/90 12/30-20/90 36/15-20/90 12/15-60/90 12/45-20/90 60/15-20/90 12/75-20/90 84/15-20/90