Add 30/9 and 18/21
1st number: 3 3/9, 2nd number: 18/21
30/9 + 18/21 is 88/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
30/9 = 30 × 7/9 × 7 = 210/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
18/21 = 18 × 3/21 × 3 = 54/63 - Add the two like fractions:
210/63 + 54/63 = 210 + 54/63 = 264/63 - 264/63 simplified gives 88/21
- So, 30/9 + 18/21 = 88/21
In mixed form: 44/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9+18/21 30/9+36/21 30/18+18/21 30/9+18/42 90/9+18/21 30/9+54/21 30/27+18/21 30/9+18/63 30/9+90/21 30/45+18/21 30/63+18/21