Subtract 5/21 from 70/75
70/75 - 5/21 is 73/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
70/75 = 70 × 7/75 × 7 = 490/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
5/21 = 5 × 25/21 × 25 = 125/525 - Subtract the two like fractions:
490/525 - 125/525 = 490 - 125/525 = 365/525 - After reducing the fraction, the answer is 73/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75-10/21 70/75-5/42 70/75-15/21 70/75-5/63 70/75-25/21 70/75-35/21