When we add 1000 to a number less than a thousand, we must place a 1 in the Thousands column.

Here is the number 623 shown on a **Hundreds Tens Units** grid.

When we add 1000 to this number, we use an extra column to the left.

This is the Thousands column.

We get the number **1623**.

623 + 1000 = 1623

**Don't forget zeros!**

Here is 52 shown on a grid.

When we add 1000, we get:

Notice that there are no hundreds.

This number is **1052**.

52 + 1000 = 1052