Add 12/45 and 30/81
12/45 + 30/81 is 86/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 45 × 9 = 405,
12/45 = 12 × 9/45 × 9 = 108/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
30/81 = 30 × 5/81 × 5 = 150/405 - Add the two like fractions:
108/405 + 150/405 = 108 + 150/405 = 258/405 - 258/405 simplified gives 86/135
- So, 12/45 + 30/81 = 86/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/45+30/81 12/45+60/81 12/90+30/81 36/45+30/81 12/45+90/81 60/45+30/81 84/45+30/81