Add 54/21 and 54/15
1st number: 2 12/21, 2nd number: 3 9/15
54/21 + 54/15 is 216/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
54/21 = 54 × 5/21 × 5 = 270/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
54/15 = 54 × 7/15 × 7 = 378/105 - Add the two like fractions:
270/105 + 378/105 = 270 + 378/105 = 648/105 - 648/105 simplified gives 216/35
- So, 54/21 + 54/15 = 216/35
In mixed form: 66/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+54/15 54/21+54/30 54/63+54/15 54/21+54/45 54/21+54/75