Mental Squaring

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Square two-digit numbers in your head. 

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Abundant, Deficient, and Perfect

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Find patterns among abundant, deficient, and perfect numbers. 

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Abundant Numbers III

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Examine abundant numbers.

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Abundant Numbers II

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Determine if Sam’s claim about abundant numbers is true.

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Abundant Numbers

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Find abundant numbers. 

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Locker Counting

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Which locker doors will be open when a given process is complete?

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Divisibility by Eight

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Explore a possible rule for checking divisibility by eight.

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Multiples of Nine

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Find a relationship pertaining to the digits in a multiple of 9.

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Don’t Just Say “It’s Undefined”

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Consider division by 0 and 1.

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Cutting Hair

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Determine how long a hair cutter works on a busy day.

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