Add 18/20 and 16/81
18/20 + 16/81 is 889/810.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
18/20 = 18 × 81/20 × 81 = 1458/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
16/81 = 16 × 20/81 × 20 = 320/1620 - Add the two like fractions:
1458/1620 + 320/1620 = 1458 + 320/1620 = 1778/1620 - 1778/1620 simplified gives 889/810
- So, 18/20 + 16/81 = 889/810
In mixed form: 179/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+16/81 18/20+32/81 18/40+16/81 54/20+16/81 18/20+48/81 18/60+16/81 90/20+16/81 18/20+80/81