Subtract 40/20 from 18/15
1st number: 1 3/15, 2nd number: 2 0/20
18/15 - 40/20 is -4/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
18/15 = 18 × 4/15 × 4 = 72/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
40/20 = 40 × 3/20 × 3 = 120/60 - Subtract the two like fractions:
72/60 - 120/60 = 72 - 120/60 = -48/60 - After reducing the fraction, the answer is -4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-40/20 18/15-80/20 18/30-40/20 54/15-40/20 18/45-40/20 18/15-40/60 90/15-40/20 18/75-40/20