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Secret Roman brainteaser Brainteaser

by David Shaw, 6 May 2021 | 0 comments

Brain icon

Difficulty: Tricky Can you take 2 from FIVE and leave 4?

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Maya numbers Activity

by David Shaw, 7 March 2017 | 19 comments

An excerpt from the Dresden Codex.

The numbers that we use are not the only way to write numbers. You might know how to count with tally marks, or read Roman numerals. But there are plenty of other ways to write numbers. This one comes from the Maya people.

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