Subtract 81/27 from 5/20
1st number: 5/20, 2nd number: 3 0/27
5/20 - 81/27 is -11/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 27 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 20 × 27 = 540,
5/20 = 5 × 27/20 × 27 = 135/540 - Likewise, for the 2nd fraction, since 27 × 20 = 540,
81/27 = 81 × 20/27 × 20 = 1620/540 - Subtract the two like fractions:
135/540 - 1620/540 = 135 - 1620/540 = -1485/540 - After reducing the fraction, the answer is -11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-81/27 5/40-81/27 5/20-81/54 15/20-81/27 5/60-81/27 25/20-81/27 35/20-81/27