Subtract 27/21 from 8/28
1st number: 8/28, 2nd number: 1 6/21
8/28 - 27/21 is -1/1.
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,
8/28 = 8 × 3/28 × 3 = 24/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
27/21 = 27 × 4/21 × 4 = 108/84 - Subtract the two like fractions:
24/84 - 108/84 = 24 - 108/84 = -84/84 - After reducing the fraction, the answer is -1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/28-27/21 8/28-54/21 8/56-27/21 8/28-27/42 24/28-27/21 8/28-81/21 8/84-27/21 8/28-27/63 40/28-27/21 56/28-27/21