Add 81/60 and 15/42
1st number: 1 21/60, 2nd number: 15/42
81/60 + 15/42 is 239/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
81/60 = 81 × 7/60 × 7 = 567/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
15/42 = 15 × 10/42 × 10 = 150/420 - Add the two like fractions:
567/420 + 150/420 = 567 + 150/420 = 717/420 - 717/420 simplified gives 239/140
- So, 81/60 + 15/42 = 239/140
In mixed form: 199/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/60+30/42 81/60+15/84 81/60+45/42 81/60+75/42