Subtract 24/21 from 27/28
1st number: 27/28, 2nd number: 1 3/21
27/28 - 24/21 is -5/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
27/28 = 27 × 3/28 × 3 = 81/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
24/21 = 24 × 4/21 × 4 = 96/84 - Subtract the two like fractions:
81/84 - 96/84 = 81 - 96/84 = -15/84 - After reducing the fraction, the answer is -5/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28-24/21 27/28-48/21 27/56-24/21 27/28-24/42 81/28-24/21 27/28-72/21 27/84-24/21 27/28-24/63