Subtract 70/8 from 72/15
1st number: 4 12/15, 2nd number: 8 6/8
72/15 - 70/8 is -79/20.
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,
72/15 = 72 × 8/15 × 8 = 576/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
70/8 = 70 × 15/8 × 15 = 1050/120 - Subtract the two like fractions:
576/120 - 1050/120 = 576 - 1050/120 = -474/120 - After reducing the fraction, the answer is -79/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/30-70/8 72/15-70/16 72/45-70/8 72/15-70/24 72/75-70/8 72/15-70/40 72/15-70/56