Add 54/15 and 6/21
1st number: 3 9/15, 2nd number: 6/21
54/15 + 6/21 is 136/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
54/15 = 54 × 7/15 × 7 = 378/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
6/21 = 6 × 5/21 × 5 = 30/105 - Add the two like fractions:
378/105 + 30/105 = 378 + 30/105 = 408/105 - 408/105 simplified gives 136/35
- So, 54/15 + 6/21 = 136/35
In mixed form: 331/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15+12/21 54/30+6/21 54/15+6/42 54/15+18/21 54/45+6/21 54/15+6/63 54/15+30/21 54/75+6/21 54/15+42/21