Add 30/18 and 27/21
1st number: 1 12/18, 2nd number: 1 6/21
30/18 + 27/21 is 62/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
30/18 = 30 × 7/18 × 7 = 210/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
27/21 = 27 × 6/21 × 6 = 162/126 - Add the two like fractions:
210/126 + 162/126 = 210 + 162/126 = 372/126 - 372/126 simplified gives 62/21
- So, 30/18 + 27/21 = 62/21
In mixed form: 220/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+27/21 30/18+54/21 30/36+27/21 30/18+27/42 90/18+27/21 30/18+81/21 30/54+27/21 30/18+27/63 30/90+27/21