Add 5/20 and 20/81
5/20 + 20/81 is 161/324.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
5/20 = 5 × 81/20 × 81 = 405/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
20/81 = 20 × 20/81 × 20 = 400/1620 - Add the two like fractions:
405/1620 + 400/1620 = 405 + 400/1620 = 805/1620 - 805/1620 simplified gives 161/324
- So, 5/20 + 20/81 = 161/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+20/81 5/20+40/81 5/40+20/81 15/20+20/81 5/20+60/81 5/60+20/81 25/20+20/81 35/20+20/81