Subtract 70/45 from 21/15
1st number: 1 6/15, 2nd number: 1 25/45
21/15 - 70/45 is -7/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
21/15 = 21 × 3/15 × 3 = 63/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
70/45 = 70 × 1/45 × 1 = 70/45 - Subtract the two like fractions:
63/45 - 70/45 = 63 - 70/45 = -7/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-70/45 21/30-70/45 21/15-70/90 63/15-70/45 21/45-70/45 21/75-70/45