Subtract 21/18 from 49/63
1st number: 49/63, 2nd number: 1 3/18
49/63 - 21/18 is -7/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
49/63 = 49 × 2/63 × 2 = 98/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Subtract the two like fractions:
98/126 - 147/126 = 98 - 147/126 = -49/126 - After reducing the fraction, the answer is -7/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/63-21/18 49/63-42/18 49/63-21/36 49/63-63/18 49/63-21/54 49/63-21/90