Subtract 72/15 from 18/8
1st number: 2 2/8, 2nd number: 4 12/15
18/8 - 72/15 is -51/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
18/8 = 18 × 15/8 × 15 = 270/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
72/15 = 72 × 8/15 × 8 = 576/120 - Subtract the two like fractions:
270/120 - 576/120 = 270 - 576/120 = -306/120 - After reducing the fraction, the answer is -51/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/8-72/15 18/16-72/15 18/8-72/30 54/8-72/15 18/24-72/15 18/8-72/45 90/8-72/15 18/40-72/15 18/8-72/75 18/56-72/15