Add 9/40 and 4/81
9/40 + 4/81 is 889/3240.
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,
4/81 = 4 × 40/81 × 40 = 160/3240 - Add the two like fractions:
729/3240 + 160/3240 = 729 + 160/3240 = 889/3240 - So, 9/40 + 4/81 = 889/3240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+4/81 9/40+8/81 9/80+4/81 27/40+4/81 9/40+12/81 45/40+4/81 9/40+20/81 63/40+4/81 9/40+28/81