Subtract 84/27 from 21/15
1st number: 1 6/15, 2nd number: 3 3/27
21/15 - 84/27 is -77/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 15 × 9 = 135,
21/15 = 21 × 9/15 × 9 = 189/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
84/27 = 84 × 5/27 × 5 = 420/135 - Subtract the two like fractions:
189/135 - 420/135 = 189 - 420/135 = -231/135 - After reducing the fraction, the answer is -77/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-84/27 21/30-84/27 21/15-84/54 63/15-84/27 21/45-84/27 21/15-84/81 21/75-84/27