This is a unit for teachers about the set of natural numbers 1 to 99. More than 100 questions, activities, and conjectures about natural numbers 1 to 99. Odd numbers, even numbers, prime numbers, composite numbers, factors, sums of factors, and so on, Plus uphill numbers, flat numbers, downhill numbers, palprimes, and emirps.

This is the third unit in a set of three units. The other two units are the reference units:

Natural Numbers 1 to 99

Natural Numbers 1 to 99 -Tables

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