Subtract 2/84 from 70/21
1st number: 3 7/21, 2nd number: 2/84
70/21 - 2/84 is 139/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
2/84 = 2 × 1/84 × 1 = 2/84 - Subtract the two like fractions:
280/84 - 2/84 = 280 - 2/84 = 278/84 - After reducing the fraction, the answer is 139/42
- In mixed form: 313/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-4/84 70/42-2/84 70/21-6/84 70/63-2/84 70/21-10/84 70/21-14/84