Add 28/81 and 84/20
1st number: 28/81, 2nd number: 4 4/20
28/81 + 84/20 is 1841/405.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
28/81 = 28 × 20/81 × 20 = 560/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
84/20 = 84 × 81/20 × 81 = 6804/1620 - Add the two like fractions:
560/1620 + 6804/1620 = 560 + 6804/1620 = 7364/1620 - 7364/1620 simplified gives 1841/405
- So, 28/81 + 84/20 = 1841/405
In mixed form: 4221/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/81+84/20 28/81+84/40 84/81+84/20 28/81+84/60