Add 5/21 and 27/30
5/21 + 27/30 is 239/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
27/30 = 27 × 7/30 × 7 = 189/210 - Add the two like fractions:
50/210 + 189/210 = 50 + 189/210 = 239/210 - So, 5/21 + 27/30 = 239/210
In mixed form: 129/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+27/30 5/21+54/30 5/42+27/30 5/21+27/60 15/21+27/30 5/21+81/30 5/63+27/30 5/21+27/90 25/21+27/30 35/21+27/30