Subtract 40/8 from 18/15
1st number: 1 3/15, 2nd number: 5 0/8
18/15 - 40/8 is -19/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
18/15 = 18 × 8/15 × 8 = 144/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
40/8 = 40 × 15/8 × 15 = 600/120 - Subtract the two like fractions:
144/120 - 600/120 = 144 - 600/120 = -456/120 - After reducing the fraction, the answer is -19/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-40/8 18/15-80/8 18/30-40/8 18/15-40/16 54/15-40/8 18/45-40/8 18/15-40/24 90/15-40/8 18/75-40/8 18/15-40/56