Add 30/28 and 81/60
1st number: 1 2/28, 2nd number: 1 21/60
30/28 + 81/60 is 339/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
30/28 = 30 × 15/28 × 15 = 450/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
81/60 = 81 × 7/60 × 7 = 567/420 - Add the two like fractions:
450/420 + 567/420 = 450 + 567/420 = 1017/420 - 1017/420 simplified gives 339/140
- So, 30/28 + 81/60 = 339/140
In mixed form: 259/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28+81/60 30/56+81/60 90/28+81/60 30/84+81/60