Add 42/21 and 4/81
1st number: 2 0/21, 2nd number: 4/81
42/21 + 4/81 is 166/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
42/21 = 42 × 27/21 × 27 = 1134/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
4/81 = 4 × 7/81 × 7 = 28/567 - Add the two like fractions:
1134/567 + 28/567 = 1134 + 28/567 = 1162/567 - 1162/567 simplified gives 166/81
- So, 42/21 + 4/81 = 166/81
In mixed form: 24/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+4/81 42/21+8/81 42/21+12/81 42/63+4/81 42/21+20/81 42/21+28/81