Add 70/84 and 12/9
1st number: 70/84, 2nd number: 1 3/9
70/84 + 12/9 is 13/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
70/84 = 70 × 3/84 × 3 = 210/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
12/9 = 12 × 28/9 × 28 = 336/252 - Add the two like fractions:
210/252 + 336/252 = 210 + 336/252 = 546/252 - 546/252 simplified gives 13/6
- So, 70/84 + 12/9 = 13/6
In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+24/9 70/84+12/18 70/84+36/9 70/84+12/27 70/84+60/9 70/84+12/45 70/84+84/9 70/84+12/63