Say you want to count all the rough primes between 1 and 200. First, consider a handful of the smallest primes—like 2, 3, 5, and 7. Then list all the numbers that aren’t divisible by those primes.

One of my favorite anecdotes about prime numbers concerns Alexander Grothendieck ... mathematician Neil Sloane overheard during a meal between two of his colleagues, Armand Borel and the late ...

They can be printed out in the comfort of home and used during quiet time, in between lessons, or as part of a structured daily routine. Number tracing worksheets are a simple, yet effective tool for ...