Subtract 15/16 from 12/21
12/21 - 15/16 is -41/112.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
12/21 = 12 × 16/21 × 16 = 192/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
15/16 = 15 × 21/16 × 21 = 315/336 - Subtract the two like fractions:
192/336 - 315/336 = 192 - 315/336 = -123/336 - After reducing the fraction, the answer is -41/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-15/16 12/21-30/16 12/42-15/16 12/21-15/32 36/21-15/16 12/21-45/16 12/63-15/16 12/21-15/48 60/21-15/16 12/21-75/16 12/21-15/80 84/21-15/16