Subtract 30/72 from 70/21
1st number: 3 7/21, 2nd number: 30/72
70/21 - 30/72 is 35/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
70/21 = 70 × 24/21 × 24 = 1680/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
30/72 = 30 × 7/72 × 7 = 210/504 - Subtract the two like fractions:
1680/504 - 210/504 = 1680 - 210/504 = 1470/504 - After reducing the fraction, the answer is 35/12
- In mixed form: 211/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-60/72 70/42-30/72 70/21-90/72 70/63-30/72