Add 18/42 and 12/30
18/42 + 12/30 is 29/35.
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,
18/42 = 18 × 5/42 × 5 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
12/30 = 12 × 7/30 × 7 = 84/210 - Add the two like fractions:
90/210 + 84/210 = 90 + 84/210 = 174/210 - 174/210 simplified gives 29/35
- So, 18/42 + 12/30 = 29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+12/30 18/42+24/30 18/84+12/30 18/42+12/60 54/42+12/30 18/42+36/30 18/42+12/90 90/42+12/30 18/42+60/30 18/42+84/30