This calculator activity can be done either by pairs or the whole class.

There are two main purposes:

          Finding patterns and rules concerning factors.

          Learning more about the numbers up to 100 including primes.
Put 36 into the memory of your calculator and find which numbers divide exactly into it.

How many factors has 36?

Try with other numbers up to 100.

Can you find numbers with only 2 factors?

Can you find other numbers with an odd number of factors?

Is there a rule?