Add 18/42 and 45/30
1st number: 18/42, 2nd number: 1 15/30
18/42 + 45/30 is 27/14.
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,
45/30 = 45 × 7/30 × 7 = 315/210 - Add the two like fractions:
90/210 + 315/210 = 90 + 315/210 = 405/210 - 405/210 simplified gives 27/14
- So, 18/42 + 45/30 = 27/14
In mixed form: 113/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+45/30 18/42+90/30 18/84+45/30 18/42+45/60 54/42+45/30 18/42+45/90 90/42+45/30