Add 20/7 and 15/81
1st number: 2 6/7, 2nd number: 15/81
20/7 + 15/81 is 575/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
20/7 = 20 × 81/7 × 81 = 1620/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
15/81 = 15 × 7/81 × 7 = 105/567 - Add the two like fractions:
1620/567 + 105/567 = 1620 + 105/567 = 1725/567 - 1725/567 simplified gives 575/189
- So, 20/7 + 15/81 = 575/189
In mixed form: 38/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7+15/81 20/7+30/81 20/14+15/81 60/7+15/81 20/7+45/81 20/21+15/81 20/7+75/81 20/35+15/81 20/49+15/81