Add 35/21 and 80/90
1st number: 1 14/21, 2nd number: 80/90
35/21 + 80/90 is 23/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
35/21 = 35 × 30/21 × 30 = 1050/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
80/90 = 80 × 7/90 × 7 = 560/630 - Add the two like fractions:
1050/630 + 560/630 = 1050 + 560/630 = 1610/630 - 1610/630 simplified gives 23/9
- So, 35/21 + 80/90 = 23/9
In mixed form: 25/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+80/90 35/42+80/90 35/63+80/90