Subtract 1/27 from 21/72
21/72 - 1/27 is 55/216.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 27 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 72 × 3 = 216,
21/72 = 21 × 3/72 × 3 = 63/216 - Likewise, for the 2nd fraction, since 27 × 8 = 216,
1/27 = 1 × 8/27 × 8 = 8/216 - Subtract the two like fractions:
63/216 - 8/216 = 63 - 8/216 = 55/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72-1/27 21/72-2/27 21/72-1/54 63/72-1/27 21/72-3/27 21/72-1/81 21/72-5/27 21/72-7/27