Subtract 12/15 from 4/20
4/20 - 12/15 is -3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
4/20 = 4 × 3/20 × 3 = 12/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
12/15 = 12 × 4/15 × 4 = 48/60 - Subtract the two like fractions:
12/60 - 48/60 = 12 - 48/60 = -36/60 - After reducing the fraction, the answer is -3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20-12/15 4/20-24/15 4/40-12/15 4/20-12/30 12/20-12/15 4/20-36/15 4/60-12/15 4/20-12/45 4/20-60/15 4/20-12/75 28/20-12/15 4/20-84/15