Multiply 125 by 5.

Brief Explanation:

Step-by-step Solution:

1. Step 1: Multiply the ones digit (5) by 5: $$5 \times 5 = 25$$. Write down 5 and carry over 2.
2. Step 2: Multiply the tens digit (2) by 5: $$2 \times 5 = 10$$. Add the carried-over 2: $$10 + 2 = 12$$. Write down 2 and carry over 1.
3. Step 3: Multiply the hundreds digit (1) by 5: $$1 \times 5 = 5$$. Add the carried-over 1: $$5 + 1 = 6$$. Write down 6.

Answer: 625