Add 3/81 and 63/42
1st number: 3/81, 2nd number: 1 21/42
3/81 + 63/42 is 83/54.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 42 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 81 × 14 = 1134,
3/81 = 3 × 14/81 × 14 = 42/1134 - Likewise, for the 2nd fraction, since 42 × 27 = 1134,
63/42 = 63 × 27/42 × 27 = 1701/1134 - Add the two like fractions:
42/1134 + 1701/1134 = 42 + 1701/1134 = 1743/1134 - 1743/1134 simplified gives 83/54
- So, 3/81 + 63/42 = 83/54
In mixed form: 129/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/81+63/42 3/81+63/84 9/81+63/42 15/81+63/42 21/81+63/42