Subtract 10/18 from 70/21
1st number: 3 7/21, 2nd number: 10/18
70/21 - 10/18 is 25/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
70/21 = 70 × 6/21 × 6 = 420/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126 - Subtract the two like fractions:
420/126 - 70/126 = 420 - 70/126 = 350/126 - After reducing the fraction, the answer is 25/9
- In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-20/18 70/42-10/18 70/21-10/36 70/21-30/18 70/63-10/18 70/21-10/54 70/21-50/18 70/21-10/90 70/21-70/18