Subtract 2/12 from 12/21
12/21 - 2/12 is 17/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
12/21 = 12 × 4/21 × 4 = 48/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
2/12 = 2 × 7/12 × 7 = 14/84 - Subtract the two like fractions:
48/84 - 14/84 = 48 - 14/84 = 34/84 - After reducing the fraction, the answer is 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-2/12 12/21-4/12 12/42-2/12 12/21-2/24 36/21-2/12 12/21-6/12 12/63-2/12 12/21-2/36 60/21-2/12 12/21-10/12 12/21-2/60 84/21-2/12 12/21-14/12 12/21-2/84