Subtract 15/90 from 2/20
2/20 - 15/90 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
2/20 = 2 × 9/20 × 9 = 18/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
15/90 = 15 × 2/90 × 2 = 30/180 - Subtract the two like fractions:
18/180 - 30/180 = 18 - 30/180 = -12/180 - After reducing the fraction, the answer is -1/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/20-15/90 2/20-30/90 2/40-15/90 6/20-15/90 2/20-45/90 2/60-15/90 10/20-15/90 2/20-75/90 14/20-15/90