Add 81/42 and 10/15
1st number: 1 39/42, 2nd number: 10/15
81/42 + 10/15 is 109/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 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 15 × 14 = 210,
10/15 = 10 × 14/15 × 14 = 140/210 - Add the two like fractions:
405/210 + 140/210 = 405 + 140/210 = 545/210 - 545/210 simplified gives 109/42
- So, 81/42 + 10/15 = 109/42
In mixed form: 225/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+20/15 81/84+10/15 81/42+10/30 81/42+30/15 81/42+10/45 81/42+50/15 81/42+10/75 81/42+70/15