Subtract 7/21 from 18/14
1st number: 1 4/14, 2nd number: 7/21
18/14 - 7/21 is 20/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
18/14 = 18 × 3/14 × 3 = 54/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
7/21 = 7 × 2/21 × 2 = 14/42 - Subtract the two like fractions:
54/42 - 14/42 = 54 - 14/42 = 40/42 - After reducing the fraction, the answer is 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/14-7/21 18/14-14/21 18/28-7/21 18/14-7/42 54/14-7/21 18/42-7/21 18/14-7/63 90/14-7/21 18/14-35/21 18/70-7/21 18/14-49/21 18/98-7/21