Add 54/21 and 1/15
1st number: 2 12/21, 2nd number: 1/15
54/21 + 1/15 is 277/105.
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,
1/15 = 1 × 7/15 × 7 = 7/105 - Add the two like fractions:
270/105 + 7/105 = 270 + 7/105 = 277/105 - So, 54/21 + 1/15 = 277/105
In mixed form: 267/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+2/15 54/42+1/15 54/21+1/30 54/21+3/15 54/63+1/15 54/21+1/45 54/21+5/15 54/21+1/75 54/21+7/15