Prime factors rich task

A complete lesson on prime factors, but not the usual questions. Intended as a challenging task to come after pupils are familiar with the process of expressing a number as a product of prime factors (see my other resources for a lesson on this).

Activities included:

Starter:
A nice ‘puzzle’ where pupils work out three seemingly unrelated multiplication sums (a good chance to practice another non-calculator skill), only to find they give the same answer. Intended to stimulate some discussion about prime factors.

Main:

• Four mini-activities, where pupils use one number’s prime factor form to obtain the prime factor form of some related numbers.
• An opportunity for pupils to be creative and come up with their own puzzles.

Plenary:
A final puzzle to check pupils’ understanding of the key idea of the lesson.

Printable worksheets and answers included.

Please review it if you buy as any feedback is appreciated!