When we add 1,000 to a four-digit number, we must increase the digit in the thousands column by 1.
Here is the number 1,623 shown on an abacus.
Notice that the abacus says units. Units are another word for ones.
When we add 1,000, we add an extra number to the thousands column.
1,623 + 1,000 = 2,623
Add 1,000 to:
We increase the 5 in the thousands column by 1 to get 6 in that column.
5,028 + 1,000 = 6,028
It's that simple! Let's try some questions now.