Subtract 2/18 from 12/21
12/21 - 2/18 is 29/63.
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,
2/18 = 2 × 7/18 × 7 = 14/126 - Subtract the two like fractions:
72/126 - 14/126 = 72 - 14/126 = 58/126 - After reducing the fraction, the answer is 29/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-2/18 12/21-4/18 12/42-2/18 12/21-2/36 36/21-2/18 12/21-6/18 12/63-2/18 12/21-2/54 60/21-2/18 12/21-10/18 12/21-2/90 84/21-2/18 12/21-14/18