Subtract 21/81 from 2/16
2/16 - 21/81 is -29/216.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 81 is 1296
Next, find the equivalent fraction of both fractional numbers with denominator 1296 - For the 1st fraction, since 16 × 81 = 1296,
2/16 = 2 × 81/16 × 81 = 162/1296 - Likewise, for the 2nd fraction, since 81 × 16 = 1296,
21/81 = 21 × 16/81 × 16 = 336/1296 - Subtract the two like fractions:
162/1296 - 336/1296 = 162 - 336/1296 = -174/1296 - After reducing the fraction, the answer is -29/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/16-21/81 2/16-42/81 2/32-21/81 6/16-21/81 2/16-63/81 2/48-21/81 10/16-21/81 2/80-21/81 14/16-21/81