Subtract 70/15 from 21/8
1st number: 2 5/8, 2nd number: 4 10/15
21/8 - 70/15 is -49/24.
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,
21/8 = 21 × 15/8 × 15 = 315/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
70/15 = 70 × 8/15 × 8 = 560/120 - Subtract the two like fractions:
315/120 - 560/120 = 315 - 560/120 = -245/120 - After reducing the fraction, the answer is -49/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-70/15 21/16-70/15 21/8-70/30 63/8-70/15 21/24-70/15 21/8-70/45 21/40-70/15 21/8-70/75 21/56-70/15