Subtract 84/18 from 25/21
1st number: 1 4/21, 2nd number: 4 12/18
25/21 - 84/18 is -73/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
25/21 = 25 × 6/21 × 6 = 150/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
84/18 = 84 × 7/18 × 7 = 588/126 - Subtract the two like fractions:
150/126 - 588/126 = 150 - 588/126 = -438/126 - After reducing the fraction, the answer is -73/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21-84/18 25/42-84/18 25/21-84/36 75/21-84/18 25/63-84/18 25/21-84/54 25/21-84/90