Subtract 21/8 from 28/27
1st number: 1 1/27, 2nd number: 2 5/8
28/27 - 21/8 is -343/216.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 8 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 27 × 8 = 216,
28/27 = 28 × 8/27 × 8 = 224/216 - Likewise, for the 2nd fraction, since 8 × 27 = 216,
21/8 = 21 × 27/8 × 27 = 567/216 - Subtract the two like fractions:
224/216 - 567/216 = 224 - 567/216 = -343/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/27-21/8 28/27-42/8 28/54-21/8 28/27-21/16 84/27-21/8 28/27-63/8 28/81-21/8 28/27-21/24 28/27-21/40 28/27-21/56