Add 28/21 and 70/9
1st number: 1 7/21, 2nd number: 7 7/9
28/21 + 70/9 is 82/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
28/21 = 28 × 3/21 × 3 = 84/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
70/9 = 70 × 7/9 × 7 = 490/63 - Add the two like fractions:
84/63 + 490/63 = 84 + 490/63 = 574/63 - 574/63 simplified gives 82/9
- So, 28/21 + 70/9 = 82/9
In mixed form: 91/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+70/9 28/42+70/9 28/21+70/18 84/21+70/9 28/63+70/9 28/21+70/27 28/21+70/45 28/21+70/63