Add 84/14 and 70/21
1st number: 6 0/14, 2nd number: 3 7/21
84/14 + 70/21 is 28/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
84/14 = 84 × 3/14 × 3 = 252/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42 - Add the two like fractions:
252/42 + 140/42 = 252 + 140/42 = 392/42 - 392/42 simplified gives 28/3
- So, 84/14 + 70/21 = 28/3
In mixed form: 91/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/28+70/21 84/14+70/42 84/42+70/21 84/14+70/63 84/70+70/21 84/98+70/21