Starting at 0 we can count up in 1000s like this:

0    1000    2000    3000    4000    5000    6000    7000    8000    9000    10000    11000    12000 ...

We add 1000 to the previous number to get the next.

These are the multiples of 1000.

Notice that they all end in 000.

Example

When we count up in 1000s, what comes after 4000?

Answer

Start with a multiple of 1000 that you know.

1000    2000    3000    4000    5000

Example

When we count up in 1000s, what comes before 10000?

Answer

List the multiples of 1000 near 10000.

8000    9000    10000    11000    12000