Add 15/42 and 25/30
15/42 + 25/30 is 25/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
15/42 = 15 × 5/42 × 5 = 75/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
25/30 = 25 × 7/30 × 7 = 175/210 - Add the two like fractions:
75/210 + 175/210 = 75 + 175/210 = 250/210 - 250/210 simplified gives 25/21
- So, 15/42 + 25/30 = 25/21
In mixed form: 14/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+25/30 15/42+50/30 15/84+25/30 15/42+25/60 45/42+25/30 15/42+75/30 15/42+25/90 75/42+25/30