Subtract 10/18 from 18/21
18/21 - 10/18 is 19/63.
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,
10/18 = 10 × 7/18 × 7 = 70/126 - Subtract the two like fractions:
108/126 - 70/126 = 108 - 70/126 = 38/126 - After reducing the fraction, the answer is 19/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-10/18 18/21-20/18 18/42-10/18 18/21-10/36 54/21-10/18 18/21-30/18 18/63-10/18 18/21-10/54 90/21-10/18 18/21-50/18 18/21-10/90 18/21-70/18