Subtract 84/54 from 10/21
1st number: 10/21, 2nd number: 1 30/54
10/21 - 84/54 is -68/63.
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,
10/21 = 10 × 18/21 × 18 = 180/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
84/54 = 84 × 7/54 × 7 = 588/378 - Subtract the two like fractions:
180/378 - 588/378 = 180 - 588/378 = -408/378 - After reducing the fraction, the answer is -68/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-84/54 10/42-84/54 30/21-84/54 10/63-84/54 50/21-84/54 70/21-84/54