Add 81/21 and 54/6
1st number: 3 18/21, 2nd number: 9 0/6
81/21 + 54/6 is 90/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
81/21 = 81 × 2/21 × 2 = 162/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
54/6 = 54 × 7/6 × 7 = 378/42 - Add the two like fractions:
162/42 + 378/42 = 162 + 378/42 = 540/42 - 540/42 simplified gives 90/7
- So, 81/21 + 54/6 = 90/7
In mixed form: 126/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+54/6 81/21+54/12 81/63+54/6 81/21+54/18 81/21+54/30 81/21+54/42