Add 40/81 and 20/40
40/81 + 20/40 is 161/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 40 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 81 × 40 = 3240,
40/81 = 40 × 40/81 × 40 = 1600/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
20/40 = 20 × 81/40 × 81 = 1620/3240 - Add the two like fractions:
1600/3240 + 1620/3240 = 1600 + 1620/3240 = 3220/3240 - 3220/3240 simplified gives 161/162
- So, 40/81 + 20/40 = 161/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/81+20/40 40/81+20/80 40/81+60/40