Subtract 4/15 from 20/40
20/40 - 4/15 is 7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
20/40 = 20 × 3/40 × 3 = 60/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
4/15 = 4 × 8/15 × 8 = 32/120 - Subtract the two like fractions:
60/120 - 32/120 = 60 - 32/120 = 28/120 - After reducing the fraction, the answer is 7/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-8/15 20/80-4/15 20/40-4/30 60/40-4/15 20/40-12/15 20/40-4/45 20/40-20/15 20/40-4/75 20/40-28/15