Subtract 16/21 from 16/81
16/81 - 16/21 is -320/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 21 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
16/81 = 16 × 7/81 × 7 = 112/567 - Likewise, for the 2nd fraction, since 21 × 27 = 567,
16/21 = 16 × 27/21 × 27 = 432/567 - Subtract the two like fractions:
112/567 - 432/567 = 112 - 432/567 = -320/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/81-16/21 16/81-32/21 16/81-16/42 48/81-16/21 16/81-48/21 16/81-16/63 80/81-16/21 16/81-80/21