Subtract 12/63 from 21/18
1st number: 1 3/18, 2nd number: 12/63
21/18 - 12/63 is 41/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
12/63 = 12 × 2/63 × 2 = 24/126 - Subtract the two like fractions:
147/126 - 24/126 = 147 - 24/126 = 123/126 - After reducing the fraction, the answer is 41/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-12/63 21/18-24/63 21/36-12/63 63/18-12/63 21/18-36/63 21/54-12/63 21/18-60/63 21/90-12/63 21/18-84/63