Subtract 21/27 from 9/72
9/72 - 21/27 is -47/72.
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,
9/72 = 9 × 3/72 × 3 = 27/216 - Likewise, for the 2nd fraction, since 27 × 8 = 216,
21/27 = 21 × 8/27 × 8 = 168/216 - Subtract the two like fractions:
27/216 - 168/216 = 27 - 168/216 = -141/216 - After reducing the fraction, the answer is -47/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/72-21/27 9/72-42/27 9/72-21/54 27/72-21/27 9/72-63/27 9/72-21/81 45/72-21/27 63/72-21/27