Add 84/70 and 35/21
1st number: 1 14/70, 2nd number: 1 14/21
84/70 + 35/21 is 43/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
84/70 = 84 × 3/70 × 3 = 252/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
35/21 = 35 × 10/21 × 10 = 350/210 - Add the two like fractions:
252/210 + 350/210 = 252 + 350/210 = 602/210 - 602/210 simplified gives 43/15
- So, 84/70 + 35/21 = 43/15
In mixed form: 213/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+70/21 84/70+35/42 84/70+35/63