Add 30/42 and 30/15
1st number: 30/42, 2nd number: 2 0/15
30/42 + 30/15 is 19/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
30/15 = 30 × 14/15 × 14 = 420/210 - Add the two like fractions:
150/210 + 420/210 = 150 + 420/210 = 570/210 - 570/210 simplified gives 19/7
- So, 30/42 + 30/15 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+30/15 30/42+60/15 30/84+30/15 90/42+30/15 30/42+90/15 30/42+30/45 30/42+30/75