Subtract 18/21 from 25/18
1st number: 1 7/18, 2nd number: 18/21
25/18 - 18/21 is 67/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
25/18 = 25 × 7/18 × 7 = 175/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
18/21 = 18 × 6/21 × 6 = 108/126 - Subtract the two like fractions:
175/126 - 108/126 = 175 - 108/126 = 67/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/18-18/21 25/18-36/21 25/36-18/21 25/18-18/42 75/18-18/21 25/18-54/21 25/54-18/21 25/18-18/63 25/18-90/21 25/90-18/21