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 Ones abacus.
*Notice that the abacus says units. Units are another word for ones.
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 an abacus.
When we add 1000, we get:
Notice that there are no hundreds.
This number is 1052.
52 + 1000 = 1052