Add 7/2 and 42/81
1st number: 3 1/2, 2nd number: 42/81
7/2 + 42/81 is 217/54.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 2 × 81 = 162,
7/2 = 7 × 81/2 × 81 = 567/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
42/81 = 42 × 2/81 × 2 = 84/162 - Add the two like fractions:
567/162 + 84/162 = 567 + 84/162 = 651/162 - 651/162 simplified gives 217/54
- So, 7/2 + 42/81 = 217/54
In mixed form: 41/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2+42/81 7/2+84/81 7/4+42/81 21/2+42/81 7/6+42/81 35/2+42/81 7/10+42/81 49/2+42/81 7/14+42/81