Add 20/84 and 70/9
1st number: 20/84, 2nd number: 7 7/9
20/84 + 70/9 is 505/63.
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,
20/84 = 20 × 3/84 × 3 = 60/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
70/9 = 70 × 28/9 × 28 = 1960/252 - Add the two like fractions:
60/252 + 1960/252 = 60 + 1960/252 = 2020/252 - 2020/252 simplified gives 505/63
- So, 20/84 + 70/9 = 505/63
In mixed form: 81/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+70/9 20/84+70/18 60/84+70/9 20/84+70/27 20/84+70/45 20/84+70/63