Add 36/81 and 18/20
36/81 + 18/20 is 121/90.
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,
36/81 = 36 × 20/81 × 20 = 720/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
18/20 = 18 × 81/20 × 81 = 1458/1620 - Add the two like fractions:
720/1620 + 1458/1620 = 720 + 1458/1620 = 2178/1620 - 2178/1620 simplified gives 121/90
- So, 36/81 + 18/20 = 121/90
In mixed form: 131/90
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