Subtract 28/63 from 70/21
1st number: 3 7/21, 2nd number: 28/63
70/21 - 28/63 is 26/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
70/21 = 70 × 3/21 × 3 = 210/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
28/63 = 28 × 1/63 × 1 = 28/63 - Subtract the two like fractions:
210/63 - 28/63 = 210 - 28/63 = 182/63 - After reducing the fraction, the answer is 26/9
- In mixed form: 28/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-56/63 70/42-28/63 70/21-84/63 70/63-28/63