Add 20/81 and 25/8
1st number: 20/81, 2nd number: 3 1/8
20/81 + 25/8 is 2185/648.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
20/81 = 20 × 8/81 × 8 = 160/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
25/8 = 25 × 81/8 × 81 = 2025/648 - Add the two like fractions:
160/648 + 2025/648 = 160 + 2025/648 = 2185/648 - So, 20/81 + 25/8 = 2185/648
In mixed form: 3241/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+25/8 20/81+50/8 20/81+25/16 60/81+25/8 20/81+75/8 20/81+25/24 20/81+25/40 20/81+25/56