Subtract 80/12 from 1/21
1st number: 1/21, 2nd number: 6 8/12
1/21 - 80/12 is -139/21.
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,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
80/12 = 80 × 7/12 × 7 = 560/84 - Subtract the two like fractions:
4/84 - 560/84 = 4 - 560/84 = -556/84 - After reducing the fraction, the answer is -139/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-80/12 1/42-80/12 1/21-80/24 3/21-80/12 1/63-80/12 1/21-80/36 5/21-80/12 1/21-80/60 7/21-80/12 1/21-80/84