Add 81/42 and 18/30
1st number: 1 39/42, 2nd number: 18/30
81/42 + 18/30 is 177/70.
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,
81/42 = 81 × 5/42 × 5 = 405/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Add the two like fractions:
405/210 + 126/210 = 405 + 126/210 = 531/210 - 531/210 simplified gives 177/70
- So, 81/42 + 18/30 = 177/70
In mixed form: 237/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+36/30 81/84+18/30 81/42+18/60 81/42+54/30 81/42+18/90 81/42+90/30