Add 7/5 and 20/81
1st number: 1 2/5, 2nd number: 20/81
7/5 + 20/81 is 667/405.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
7/5 = 7 × 81/5 × 81 = 567/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Add the two like fractions:
567/405 + 100/405 = 567 + 100/405 = 667/405 - So, 7/5 + 20/81 = 667/405
In mixed form: 1262/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5+20/81 7/5+40/81 7/10+20/81 21/5+20/81 7/5+60/81 7/15+20/81 35/5+20/81 7/25+20/81 49/5+20/81 7/35+20/81