Add 20/28 and 30/81
20/28 + 30/81 is 205/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 28 × 81 = 2268,
20/28 = 20 × 81/28 × 81 = 1620/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
30/81 = 30 × 28/81 × 28 = 840/2268 - Add the two like fractions:
1620/2268 + 840/2268 = 1620 + 840/2268 = 2460/2268 - 2460/2268 simplified gives 205/189
- So, 20/28 + 30/81 = 205/189
In mixed form: 116/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+30/81 20/28+60/81 20/56+30/81 60/28+30/81 20/28+90/81 20/84+30/81