Each place has a value - 1, 10, 100, or 1000. When we put digits in these places they show how many ones, tens, hundreds, and thousands the number has in it.
If we change a digit, the number will change depending on what place that the digit was changed.
Let's look at by how much a number changed when these digits change.
We'll start with 247 and we'll change the 2 in the hundreds place to a 1.
The number is now 147. It is a hundred less than 247. We took away 1 hundred.
Let's start with 422 and change the 4 to a 3.
The number is now 322. It is a hundred less than 422. Again we took away 1 hundred.
This time we'll start with 571 and we'll change the 7 to a 3.
The number is now 531. We took away 4 tens.