Add 30/21 and 54/7
1st number: 1 9/21, 2nd number: 7 5/7
30/21 + 54/7 is 64/7.
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,
30/21 = 30 × 1/21 × 1 = 30/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
54/7 = 54 × 3/7 × 3 = 162/21 - Add the two like fractions:
30/21 + 162/21 = 30 + 162/21 = 192/21 - 192/21 simplified gives 64/7
- So, 30/21 + 54/7 = 64/7
In mixed form: 91/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+54/7 30/42+54/7 30/21+54/14 90/21+54/7 30/63+54/7 30/21+54/21 30/21+54/35 30/21+54/49