Answer: 2500
Explanation:
There are multiple ways to solve this.
The most common would be to multiply each digit separately. So 0 multiplied with 5, then 0 multiplied with 5, then 1 multiplied with 5, then and line them up, so they would turn out as 500. Then to the same thing for the 2, except add 1 zero first. then that would be 2000. Then add 2000 and 500 to get 2500.
Another way is to add 25, 100 times, which isn't ideal but also works out.
One more way is to multiply 100 by 20, which is 2000, and 5 by 20 which is 500. Similar to the first way, add them up and you'll get 2500.
Hope that helped a lot.
:)