Add 30/42 and 5/15
30/42 + 5/15 is 22/21.
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,
5/15 = 5 × 14/15 × 14 = 70/210 - Add the two like fractions:
150/210 + 70/210 = 150 + 70/210 = 220/210 - 220/210 simplified gives 22/21
- So, 30/42 + 5/15 = 22/21
In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42+5/15 30/42+10/15 30/84+5/15 30/42+5/30 90/42+5/15 30/42+5/45 30/42+25/15 30/42+5/75 30/42+35/15