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When we add 1000 to a 4-digit number, we must increase the digit in the Thousands column by 1.

Here is the number 1623 shown on a Thousands Hundreds Tens Ones abacus.

*Notice that the abacus says units. Units are another word for ones. 

  

Abacus

 

When we add 1000 we add an extra number to the Thousands column.

 

Abacus

 

1623 + 1000 = 2623

 

Example

Add 1000 to:

5028

 

Answer

We increase the 5 in the Thousands column by 1 to get 6 in that column.

5028 + 1000 = 6028

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