Add 9/20 and 49/81
9/20 + 49/81 is 1709/1620.
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,
9/20 = 9 × 81/20 × 81 = 729/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
49/81 = 49 × 20/81 × 20 = 980/1620 - Add the two like fractions:
729/1620 + 980/1620 = 729 + 980/1620 = 1709/1620 - So, 9/20 + 49/81 = 1709/1620
In mixed form: 189/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20+49/81 9/20+98/81 9/40+49/81 27/20+49/81 9/60+49/81 45/20+49/81 63/20+49/81