Subtract 10/21 from 81/12
1st number: 6 9/12, 2nd number: 10/21
81/12 - 10/21 is 527/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
81/12 = 81 × 7/12 × 7 = 567/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Subtract the two like fractions:
567/84 - 40/84 = 567 - 40/84 = 527/84 - In mixed form: 623/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12-20/21 81/24-10/21 81/12-10/42 81/12-30/21 81/36-10/21 81/12-10/63 81/12-50/21 81/60-10/21 81/12-70/21 81/84-10/21