The topic comes as 4/5 lesson bundle at a reduction. I normally teach it as a sequence of lessons in the following order (obviously dependent on the group).
1 - Multiples and LCM
2 - Factors and HCF
3 - Prime Numbers
4/5 - Prime factor Trees/ Decomposition
All lessons contains a starter, lesson objectives, key words, examples, using MWB's, questions with answers and plenary. I have also attached all the additional worksheets/activities that I use as a part of these lessons. 12 files !!
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