Subtract 21/72 from 1/8
1/8 - 21/72 is -1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
1/8 = 1 × 9/8 × 9 = 9/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Subtract the two like fractions:
9/72 - 21/72 = 9 - 21/72 = -12/72 - After reducing the fraction, the answer is -1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8-21/72 1/8-42/72 1/16-21/72 3/8-21/72 1/8-63/72 1/24-21/72 5/8-21/72 1/40-21/72 7/8-21/72 1/56-21/72