Add 15/42 and 10/30
15/42 + 10/30 is 29/42.
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,
10/30 = 10 × 7/30 × 7 = 70/210 - Add the two like fractions:
75/210 + 70/210 = 75 + 70/210 = 145/210 - 145/210 simplified gives 29/42
- So, 15/42 + 10/30 = 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+10/30 15/42+20/30 15/84+10/30 15/42+10/60 45/42+10/30 15/42+10/90 75/42+10/30 15/42+50/30 15/42+70/30