Add 18/40 and 56/81
18/40 + 56/81 is 1849/1620.
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,
18/40 = 18 × 81/40 × 81 = 1458/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
56/81 = 56 × 40/81 × 40 = 2240/3240 - Add the two like fractions:
1458/3240 + 2240/3240 = 1458 + 2240/3240 = 3698/3240 - 3698/3240 simplified gives 1849/1620
- So, 18/40 + 56/81 = 1849/1620
In mixed form: 1229/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/40+56/81 18/80+56/81 54/40+56/81 90/40+56/81