Add 20/9 and 81/70
1st number: 2 2/9, 2nd number: 1 11/70
20/9 + 81/70 is 2129/630.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 9 × 70 = 630,
20/9 = 20 × 70/9 × 70 = 1400/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
81/70 = 81 × 9/70 × 9 = 729/630 - Add the two like fractions:
1400/630 + 729/630 = 1400 + 729/630 = 2129/630 - So, 20/9 + 81/70 = 2129/630
In mixed form: 3239/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9+81/70 20/18+81/70 60/9+81/70 20/27+81/70 20/45+81/70 20/63+81/70