Add 15/20 and 40/81
15/20 + 40/81 is 403/324.
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,
15/20 = 15 × 81/20 × 81 = 1215/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
40/81 = 40 × 20/81 × 20 = 800/1620 - Add the two like fractions:
1215/1620 + 800/1620 = 1215 + 800/1620 = 2015/1620 - 2015/1620 simplified gives 403/324
- So, 15/20 + 40/81 = 403/324
In mixed form: 179/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+40/81 15/20+80/81 15/40+40/81 45/20+40/81 15/60+40/81 75/20+40/81