Subtract 2/7 from 12/21
12/21 - 2/7 is 2/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
12/21 = 12 × 1/21 × 1 = 12/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
2/7 = 2 × 3/7 × 3 = 6/21 - Subtract the two like fractions:
12/21 - 6/21 = 12 - 6/21 = 6/21 - After reducing the fraction, the answer is 2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-2/7 12/21-4/7 12/42-2/7 12/21-2/14 36/21-2/7 12/21-6/7 12/63-2/7 12/21-2/21 60/21-2/7 12/21-10/7 12/21-2/35 84/21-2/7 12/21-14/7 12/21-2/49