Subtract 21/81 from 27/4
1st number: 6 3/4, 2nd number: 21/81
27/4 - 21/81 is 701/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 4 × 81 = 324,
27/4 = 27 × 81/4 × 81 = 2187/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
21/81 = 21 × 4/81 × 4 = 84/324 - Subtract the two like fractions:
2187/324 - 84/324 = 2187 - 84/324 = 2103/324 - After reducing the fraction, the answer is 701/108
- In mixed form: 653/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/4-21/81 27/4-42/81 27/8-21/81 81/4-21/81 27/4-63/81 27/12-21/81 27/20-21/81 27/28-21/81