Add 5/40 and 42/81
5/40 + 42/81 is 139/216.
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,
5/40 = 5 × 81/40 × 81 = 405/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
42/81 = 42 × 40/81 × 40 = 1680/3240 - Add the two like fractions:
405/3240 + 1680/3240 = 405 + 1680/3240 = 2085/3240 - 2085/3240 simplified gives 139/216
- So, 5/40 + 42/81 = 139/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40+42/81 5/40+84/81 5/80+42/81 15/40+42/81 25/40+42/81 35/40+42/81