Subtract 4/18 from 12/21
12/21 - 4/18 is 22/63.
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,
12/21 = 12 × 6/21 × 6 = 72/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
4/18 = 4 × 7/18 × 7 = 28/126 - Subtract the two like fractions:
72/126 - 28/126 = 72 - 28/126 = 44/126 - After reducing the fraction, the answer is 22/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-4/18 12/21-8/18 12/42-4/18 12/21-4/36 36/21-4/18 12/21-12/18 12/63-4/18 12/21-4/54 60/21-4/18 12/21-20/18 12/21-4/90 84/21-4/18 12/21-28/18