Subtract 49/10 from 20/81
1st number: 20/81, 2nd number: 4 9/10
20/81 - 49/10 is -3769/810.
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,
20/81 = 20 × 10/81 × 10 = 200/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
49/10 = 49 × 81/10 × 81 = 3969/810 - Subtract the two like fractions:
200/810 - 3969/810 = 200 - 3969/810 = -3769/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81-49/10 20/81-98/10 20/81-49/20 60/81-49/10 20/81-49/30 20/81-49/50 20/81-49/70