Perform the addition: 186 + 387

Quick explanation:

Step-by-step solution:

1. Step 1: Add the ones column: 6 + 7 = 13. Write down 3 and carry over 1 to the tens column.
2. Step 2: Add the tens column: 8 + 8 + 1 (carry-over) = 17. Write down 7 and carry over 1 to the hundreds column.
3. Step 3: Add the hundreds column: 1 + 3 + 1 (carry-over) = 5.

Answer: 573