Ben has five coins in his pocket.
How much money might he have? If possible, talk to someone else about your ideas.
What is the smallest amount of money he could have? How do you know?
What is the largest amount of money he could have? How do you know?
What if he still had five coins, but only 1ps and/or 2ps? How much might he have now?
Can you find all the possibilities?
How do you know you have found them all?