Add 20/40 and 25/81
20/40 + 25/81 is 131/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 81 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 40 × 81 = 3240,
20/40 = 20 × 81/40 × 81 = 1620/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
25/81 = 25 × 40/81 × 40 = 1000/3240 - Add the two like fractions:
1620/3240 + 1000/3240 = 1620 + 1000/3240 = 2620/3240 - 2620/3240 simplified gives 131/162
- So, 20/40 + 25/81 = 131/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+50/81 20/80+25/81 60/40+25/81 20/40+75/81