Subtract 12/7 from 1/21
1st number: 1/21, 2nd number: 1 5/7
1/21 - 12/7 is -5/3.
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,
1/21 = 1 × 1/21 × 1 = 1/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
12/7 = 12 × 3/7 × 3 = 36/21 - Subtract the two like fractions:
1/21 - 36/21 = 1 - 36/21 = -35/21 - After reducing the fraction, the answer is -5/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-12/7 1/21-24/7 1/42-12/7 1/21-12/14 3/21-12/7 1/21-36/7 1/63-12/7 1/21-12/21 5/21-12/7 1/21-60/7 1/21-12/35 7/21-12/7 1/21-84/7 1/21-12/49