Subtract 42/18 from 63/21
1st number: 3 0/21, 2nd number: 2 6/18
63/21 - 42/18 is 2/3.
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,
63/21 = 63 × 6/21 × 6 = 378/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
42/18 = 42 × 7/18 × 7 = 294/126 - Subtract the two like fractions:
378/126 - 294/126 = 378 - 294/126 = 84/126 - After reducing the fraction, the answer is 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21-84/18 63/42-42/18 63/21-42/36 63/21-42/54 63/21-42/90