Add 9/40 and 64/81
9/40 + 64/81 is 3289/3240.
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,
9/40 = 9 × 81/40 × 81 = 729/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
64/81 = 64 × 40/81 × 40 = 2560/3240 - Add the two like fractions:
729/3240 + 2560/3240 = 729 + 2560/3240 = 3289/3240 - So, 9/40 + 64/81 = 3289/3240
In mixed form: 149/3240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+64/81 9/80+64/81 27/40+64/81 45/40+64/81 63/40+64/81