Subtract 21/40 from 7/64
7/64 - 21/40 is -133/320.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 64 and 40 is 320
Next, find the equivalent fraction of both fractional numbers with denominator 320 - For the 1st fraction, since 64 × 5 = 320,
7/64 = 7 × 5/64 × 5 = 35/320 - Likewise, for the 2nd fraction, since 40 × 8 = 320,
21/40 = 21 × 8/40 × 8 = 168/320 - Subtract the two like fractions:
35/320 - 168/320 = 35 - 168/320 = -133/320
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/64-21/40 7/64-42/40 7/64-21/80 21/64-21/40 7/64-63/40 35/64-21/40 49/64-21/40