Subtract 8/21 from 21/16
1st number: 1 5/16, 2nd number: 8/21
21/16 - 8/21 is 313/336.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
21/16 = 21 × 21/16 × 21 = 441/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
8/21 = 8 × 16/21 × 16 = 128/336 - Subtract the two like fractions:
441/336 - 128/336 = 441 - 128/336 = 313/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-8/21 21/16-16/21 21/32-8/21 21/16-8/42 63/16-8/21 21/16-24/21 21/48-8/21 21/16-8/63 21/16-40/21 21/80-8/21 21/16-56/21