Add 28/21 and 81/6
1st number: 1 7/21, 2nd number: 13 3/6
28/21 + 81/6 is 89/6.
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,
28/21 = 28 × 2/21 × 2 = 56/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
81/6 = 81 × 7/6 × 7 = 567/42 - Add the two like fractions:
56/42 + 567/42 = 56 + 567/42 = 623/42 - 623/42 simplified gives 89/6
- So, 28/21 + 81/6 = 89/6
In mixed form: 145/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+81/6 28/42+81/6 28/21+81/12 84/21+81/6 28/63+81/6 28/21+81/18 28/21+81/30 28/21+81/42