Primes and simple but difficult composite factors for numbers 20 to 200

This learning set covers the primes and simple composites built from them, from 20 to 200.
There are three different components in the list:

- "Is this a prime?" - this is for primes and the difficult composites ( e.g. 62 = 31 x 2 ) up to 100.
- "What are the factor pairs of?" - this is the reverse of the above for the difficult composites.
- "What are the primes from 110 to 120?" - the primes from 100 to 200 are covered in 10 sets, covering a range of 10 each time.

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This is a set list, so as with all lists in the system, it is level-independent.