Add 21/81 and 1/45
21/81 + 1/45 is 38/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 45 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
21/81 = 21 × 5/81 × 5 = 105/405 - Likewise, for the 2nd fraction, since 45 × 9 = 405,
1/45 = 1 × 9/45 × 9 = 9/405 - Add the two like fractions:
105/405 + 9/405 = 105 + 9/405 = 114/405 - 114/405 simplified gives 38/135
- So, 21/81 + 1/45 = 38/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+1/45 21/81+2/45 21/81+1/90 63/81+1/45 21/81+3/45 21/81+5/45 21/81+7/45