Add 42/21 and 81/7
1st number: 2 0/21, 2nd number: 11 4/7
42/21 + 81/7 is 95/7.
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,
42/21 = 42 × 1/21 × 1 = 42/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
81/7 = 81 × 3/7 × 3 = 243/21 - Add the two like fractions:
42/21 + 243/21 = 42 + 243/21 = 285/21 - 285/21 simplified gives 95/7
- So, 42/21 + 81/7 = 95/7
In mixed form: 134/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+81/7 42/21+81/14 42/63+81/7 42/21+81/21 42/21+81/35 42/21+81/49