Subtract 1/18 from 18/21
18/21 - 1/18 is 101/126.
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,
18/21 = 18 × 6/21 × 6 = 108/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
1/18 = 1 × 7/18 × 7 = 7/126 - Subtract the two like fractions:
108/126 - 7/126 = 108 - 7/126 = 101/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-1/18 18/21-2/18 18/42-1/18 18/21-1/36 54/21-1/18 18/21-3/18 18/63-1/18 18/21-1/54 90/21-1/18 18/21-5/18 18/21-1/90 18/21-7/18