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So here are a couple of nice resources I've made, really getting underneath prime factors, HCF and LCM. If you just want to go straight in, the resources are here: 
We start of with some really basic getting underneath the concept of what is a prime factor decomposition, using non examples and examples.  And then slowly work through a series of tasks, getting kids to pay attention to the product part of the product of prime factors, getting kids to write the product, given the decomposition, fill in missing parts of the decomposition before actually doing it themselves.    Then in the second PDF, we start to look at using prime factors for HCF and LCM. But before that, we spend ages getting students familiar with the Venn diagrams themselves. So this involves just identifying the numbers from a Venn Diagram, reading the HCF and LCM from a Venn diagram, populating the Venn diagram etc before actually doing it all themselves. I'm certain many lower attaining students will find these scaffolds invaluable.       
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