Add 3/30 and 21/18
1st number: 3/30, 2nd number: 1 3/18
3/30 + 21/18 is 19/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
3/30 = 3 × 3/30 × 3 = 9/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Add the two like fractions:
9/90 + 105/90 = 9 + 105/90 = 114/90 - 114/90 simplified gives 19/15
- So, 3/30 + 21/18 = 19/15
In mixed form: 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30+21/18 3/30+42/18 3/60+21/18 3/30+21/36 9/30+21/18 3/30+63/18 3/90+21/18 3/30+21/54 15/30+21/18 3/30+21/90 21/30+21/18