Subtract 1/21 from 70/12
1st number: 5 10/12, 2nd number: 1/21
70/12 - 1/21 is 81/14.
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,
70/12 = 70 × 7/12 × 7 = 490/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Subtract the two like fractions:
490/84 - 4/84 = 490 - 4/84 = 486/84 - After reducing the fraction, the answer is 81/14
- In mixed form: 511/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/12-2/21 70/24-1/21 70/12-1/42 70/12-3/21 70/36-1/21 70/12-1/63 70/12-5/21 70/60-1/21 70/12-7/21 70/84-1/21