Subtract 21/10 from 6/81
1st number: 6/81, 2nd number: 2 1/10
6/81 - 21/10 is -547/270.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
6/81 = 6 × 10/81 × 10 = 60/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
21/10 = 21 × 81/10 × 81 = 1701/810 - Subtract the two like fractions:
60/810 - 1701/810 = 60 - 1701/810 = -1641/810 - After reducing the fraction, the answer is -547/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/81-21/10 6/81-42/10 6/81-21/20 18/81-21/10 6/81-63/10 6/81-21/30 30/81-21/10 6/81-21/50 42/81-21/10 6/81-21/70