Add 21/81 and 4/30
21/81 + 4/30 is 53/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 30 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Likewise, for the 2nd fraction, since 30 × 27 = 810,
4/30 = 4 × 27/30 × 27 = 108/810 - Add the two like fractions:
210/810 + 108/810 = 210 + 108/810 = 318/810 - 318/810 simplified gives 53/135
- So, 21/81 + 4/30 = 53/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+4/30 21/81+8/30 21/81+4/60 63/81+4/30 21/81+12/30 21/81+4/90 21/81+20/30 21/81+28/30