Starting at 0 we can count up in 25s like this:

0    25    50    75    100    125    150    175    200    225    250    275    300 ...

We add 25 to the previous number to get the next.

These are the multiples of 25.

Notice that they all end in 0, 25, 50 or 75.

Example

When we count up in 25s, what comes after 175?

Answer

Start with a multiple of 25 that you know.

100    125    150    175    200

Example

When we count up in 25s, what comes before 150?

Answer

List the multiples of 25 near 100.

100    125    150    175    200