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Binary numbers are sums of powers of two. How does this affect which of them are even and which are odd?

For a mobile to be balanced, every level needs to be balanced. What supports have to move to achieve balance?

There are two ways all of the constraints of this puzzle can be satisfied. What might the two solutions have in common?

Factorials are big. Really, really big. How can we find the final digits of a large factorial?

What can you infer from the information provided about these foods to put them in order by price?

Calcdoku puzzles are solved with logic and arithmetic. In this one, the arithmetic is complex!

Someone forgot to shut the tailgate. Would more friction have helped to prevent this mess?

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