Add 15/30 and 30/18
1st number: 15/30, 2nd number: 1 12/18
15/30 + 30/18 is 13/6.
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,
15/30 = 15 × 3/30 × 3 = 45/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Add the two like fractions:
45/90 + 150/90 = 45 + 150/90 = 195/90 - 195/90 simplified gives 13/6
- So, 15/30 + 30/18 = 13/6
In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30+60/18 15/60+30/18 15/30+30/36 45/30+30/18 15/30+90/18 15/90+30/18 15/30+30/54 75/30+30/18 15/30+30/90