Add 27/21 and 21/90
1st number: 1 6/21, 2nd number: 21/90
27/21 + 21/90 is 319/210.
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,
27/21 = 27 × 30/21 × 30 = 810/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Add the two like fractions:
810/630 + 147/630 = 810 + 147/630 = 957/630 - 957/630 simplified gives 319/210
- So, 27/21 + 21/90 = 319/210
In mixed form: 1109/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+21/90 27/21+42/90 27/42+21/90 81/21+21/90 27/21+63/90 27/63+21/90