Subtract 18/14 from 21/63
1st number: 21/63, 2nd number: 1 4/14
21/63 - 18/14 is -20/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 14 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
21/63 = 21 × 2/63 × 2 = 42/126 - Likewise, for the 2nd fraction, since 14 × 9 = 126,
18/14 = 18 × 9/14 × 9 = 162/126 - Subtract the two like fractions:
42/126 - 162/126 = 42 - 162/126 = -120/126 - 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: 42/63-18/14 21/63-36/14 21/63-18/28 21/63-54/14 21/63-18/42 21/63-90/14 21/63-18/70 21/63-18/98