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