Common Digit

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Find the one-digit number that is just like all the others.

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Coat Check

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How many times will Allison write the digit 3?

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Apples and Oranges

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They say you cannot add apples and oranges. You do in this puzzle! Can you break the code?

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Filling Bases

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Find the missing base numbers.

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Magic Pairs

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How many pairs of “magic” numbers exist?

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Clocking the Order

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When will the digits of a digital clock be in strictly increasing order? In strictly decreasing order?

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Train Tracking

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Follow the pattern and determine the number of people who get on and off the train.

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Summing Evens

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Find a way to sum a set of even integers.

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On Target

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How many darts will Seong-Chang need to throw to earn a specific number of points?

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Nonconsecutive Grid

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Arrange the numbers in a 4×4 grid under a certain condition.

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