Add 21/81 and 75/40
1st number: 21/81, 2nd number: 1 35/40
21/81 + 75/40 is 461/216.
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,
21/81 = 21 × 40/81 × 40 = 840/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
75/40 = 75 × 81/40 × 81 = 6075/3240 - Add the two like fractions:
840/3240 + 6075/3240 = 840 + 6075/3240 = 6915/3240 - 6915/3240 simplified gives 461/216
- So, 21/81 + 75/40 = 461/216
In mixed form: 229/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+75/40 21/81+75/80 63/81+75/40