Subtract 27/84 from 1/21
1/21 - 27/84 is -23/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
27/84 = 27 × 1/84 × 1 = 27/84 - Subtract the two like fractions:
4/84 - 27/84 = 4 - 27/84 = -23/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-27/84 1/21-54/84 1/42-27/84 3/21-27/84 1/21-81/84 1/63-27/84 5/21-27/84 7/21-27/84