Subtract 21/20 from 8/27
1st number: 8/27, 2nd number: 1 1/20
8/27 - 21/20 is -407/540.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 20 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 27 × 20 = 540,
8/27 = 8 × 20/27 × 20 = 160/540 - Likewise, for the 2nd fraction, since 20 × 27 = 540,
21/20 = 21 × 27/20 × 27 = 567/540 - Subtract the two like fractions:
160/540 - 567/540 = 160 - 567/540 = -407/540
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/27-21/20 8/27-42/20 8/54-21/20 8/27-21/40 24/27-21/20 8/27-63/20 8/81-21/20 8/27-21/60 40/27-21/20 56/27-21/20