Add 28/21 and 54/60
1st number: 1 7/21, 2nd number: 54/60
28/21 + 54/60 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
28/21 = 28 × 20/21 × 20 = 560/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
54/60 = 54 × 7/60 × 7 = 378/420 - Add the two like fractions:
560/420 + 378/420 = 560 + 378/420 = 938/420 - 938/420 simplified gives 67/30
- So, 28/21 + 54/60 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+54/60 28/42+54/60 84/21+54/60 28/63+54/60