What is the sum of 15 and 27?

To find the sum of 15 and 27, you simply add the two numbers together.

Start by aligning the numbers vertically for clarity:

15

+ 27

Adding the digits in the units place first:

5 (from 15) + 7 (from 27) equals 12. Write down 2 and carry over 1 to the next column (the tens place).

Now, add the digits in the tens place including the carry:

1 (carried over) + 1 (from 15) + 2 (from 27) equals 4.

Now combine the results from both columns:

The final result is 42.

Thus, the sum of 15 and 27 is 42.