Add 72/42 and 15/81
1st number: 1 30/42, 2nd number: 15/81
72/42 + 15/81 is 359/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
72/42 = 72 × 27/42 × 27 = 1944/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
15/81 = 15 × 14/81 × 14 = 210/1134 - Add the two like fractions:
1944/1134 + 210/1134 = 1944 + 210/1134 = 2154/1134 - 2154/1134 simplified gives 359/189
- So, 72/42 + 15/81 = 359/189
In mixed form: 1170/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+30/81 72/84+15/81 72/42+45/81 72/42+75/81