Add 18/15 and 30/42
1st number: 1 3/15, 2nd number: 30/42
18/15 + 30/42 is 67/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
18/15 = 18 × 14/15 × 14 = 252/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Add the two like fractions:
252/210 + 150/210 = 252 + 150/210 = 402/210 - 402/210 simplified gives 67/35
- So, 18/15 + 30/42 = 67/35
In mixed form: 132/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+30/42 18/15+60/42 18/30+30/42 18/15+30/84 54/15+30/42 18/15+90/42 18/45+30/42 90/15+30/42 18/75+30/42