Subtract 27/4 from 18/21
1st number: 18/21, 2nd number: 6 3/4
18/21 - 27/4 is -165/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
27/4 = 27 × 21/4 × 21 = 567/84 - Subtract the two like fractions:
72/84 - 567/84 = 72 - 567/84 = -495/84 - After reducing the fraction, the answer is -165/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-27/4 18/21-54/4 18/42-27/4 18/21-27/8 54/21-27/4 18/21-81/4 18/63-27/4 18/21-27/12 90/21-27/4 18/21-27/20 18/21-27/28