Subtract 70/64 from 15/21
1st number: 15/21, 2nd number: 1 6/64
15/21 - 70/64 is -85/224.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 64 is 1344
Next, find the equivalent fraction of both fractional numbers with denominator 1344 - For the 1st fraction, since 21 × 64 = 1344,
15/21 = 15 × 64/21 × 64 = 960/1344 - Likewise, for the 2nd fraction, since 64 × 21 = 1344,
70/64 = 70 × 21/64 × 21 = 1470/1344 - Subtract the two like fractions:
960/1344 - 1470/1344 = 960 - 1470/1344 = -510/1344 - After reducing the fraction, the answer is -85/224
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21-70/64 15/42-70/64 45/21-70/64 15/63-70/64 75/21-70/64