Add 21/10 and 25/9
1st number: 2 1/10, 2nd number: 2 7/9
21/10 + 25/9 is 439/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
25/9 = 25 × 10/9 × 10 = 250/90 - Add the two like fractions:
189/90 + 250/90 = 189 + 250/90 = 439/90 - So, 21/10 + 25/9 = 439/90
In mixed form: 479/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+25/9 21/10+50/9 21/20+25/9 21/10+25/18 63/10+25/9 21/10+75/9 21/30+25/9 21/10+25/27 21/50+25/9 21/10+25/45 21/70+25/9 21/10+25/63