Subtract 84/54 from 9/21
1st number: 9/21, 2nd number: 1 30/54
9/21 - 84/54 is -71/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
9/21 = 9 × 18/21 × 18 = 162/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
84/54 = 84 × 7/54 × 7 = 588/378 - Subtract the two like fractions:
162/378 - 588/378 = 162 - 588/378 = -426/378 - After reducing the fraction, the answer is -71/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-84/54 9/42-84/54 27/21-84/54 9/63-84/54 45/21-84/54 63/21-84/54