Add 18/30 and 84/18
1st number: 18/30, 2nd number: 4 12/18
18/30 + 84/18 is 79/15.
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,
18/30 = 18 × 3/30 × 3 = 54/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
84/18 = 84 × 5/18 × 5 = 420/90 - Add the two like fractions:
54/90 + 420/90 = 54 + 420/90 = 474/90 - 474/90 simplified gives 79/15
- So, 18/30 + 84/18 = 79/15
In mixed form: 54/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+84/18 18/60+84/18 18/30+84/36 54/30+84/18 18/90+84/18 18/30+84/54 90/30+84/18 18/30+84/90