Subtract 21/64 from 15/18
15/18 - 21/64 is 97/192.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 64 is 576
Next, find the equivalent fraction of both fractional numbers with denominator 576 - For the 1st fraction, since 18 × 32 = 576,
15/18 = 15 × 32/18 × 32 = 480/576 - Likewise, for the 2nd fraction, since 64 × 9 = 576,
21/64 = 21 × 9/64 × 9 = 189/576 - Subtract the two like fractions:
480/576 - 189/576 = 480 - 189/576 = 291/576 - After reducing the fraction, the answer is 97/192
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-21/64 15/18-42/64 15/36-21/64 45/18-21/64 15/18-63/64 15/54-21/64 75/18-21/64 15/90-21/64