Add 30/18 and 5/15
1st number: 1 12/18, 2nd number: 5/15
30/18 + 5/15 is 2/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 15 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Likewise, for the 2nd fraction, since 15 × 6 = 90,
5/15 = 5 × 6/15 × 6 = 30/90 - Add the two like fractions:
150/90 + 30/90 = 150 + 30/90 = 180/90 - 180/90 simplified gives 2/1
- So, 30/18 + 5/15 = 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+5/15 30/18+10/15 30/36+5/15 30/18+5/30 90/18+5/15 30/54+5/15 30/18+5/45 30/18+25/15 30/90+5/15 30/18+5/75 30/18+35/15