Add 54/21 and 15/7
1st number: 2 12/21, 2nd number: 2 1/7
54/21 + 15/7 is 33/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
54/21 = 54 × 1/21 × 1 = 54/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
15/7 = 15 × 3/7 × 3 = 45/21 - Add the two like fractions:
54/21 + 45/21 = 54 + 45/21 = 99/21 - 99/21 simplified gives 33/7
- So, 54/21 + 15/7 = 33/7
In mixed form: 45/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+30/7 54/42+15/7 54/21+15/14 54/21+45/7 54/63+15/7 54/21+15/21 54/21+75/7 54/21+15/35 54/21+15/49