Add 20/15 and 20/81
1st number: 1 5/15, 2nd number: 20/81
20/15 + 20/81 is 128/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
20/15 = 20 × 27/15 × 27 = 540/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Add the two like fractions:
540/405 + 100/405 = 540 + 100/405 = 640/405 - 640/405 simplified gives 128/81
- So, 20/15 + 20/81 = 128/81
In mixed form: 147/81
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