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Take a square number and multiply by four. Is it guaranteed to still be a square number?
Can we generalize this rule?
Can your students explain why?
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What do you notice?
What do you wonder?
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If you are parked during any part of the time indicated, then you need to pay, even if it's only for a few minutes at the beginning or end of your shopping. (If you only are there for the five minutes between 8:00 and 8:05, you only pay a pro-rated fee.)
If you park at any random time and leave your car there for an hour, are you more likely to pay or more likely to not pay?