Add 70/75 and 6/21
70/75 + 6/21 is 128/105.
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,
70/75 = 70 × 7/75 × 7 = 490/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
6/21 = 6 × 25/21 × 25 = 150/525 - Add the two like fractions:
490/525 + 150/525 = 490 + 150/525 = 640/525 - 640/525 simplified gives 128/105
- So, 70/75 + 6/21 = 128/105
In mixed form: 123/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75+12/21 70/75+6/42 70/75+18/21 70/75+6/63 70/75+30/21 70/75+42/21