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