Add 21/75 and 70/21
1st number: 21/75, 2nd number: 3 7/21
21/75 + 70/21 is 271/75.
Steps for adding 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,
21/75 = 21 × 7/75 × 7 = 147/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
70/21 = 70 × 25/21 × 25 = 1750/525 - Add the two like fractions:
147/525 + 1750/525 = 147 + 1750/525 = 1897/525 - 1897/525 simplified gives 271/75
- So, 21/75 + 70/21 = 271/75
In mixed form: 346/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75+70/21 21/75+70/42 63/75+70/21 21/75+70/63