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Corbett Maths is very useful for teaching resources for all aspects of maths (arithmetic and reasoning). It can be used very effectively to intervene with pupils who may be finding maths lessons very difficult
Myminimaths is very powerful for pupils (especially in Y5/6) who have not yet secured a written method for every type of calculation. It is to be used as an intervention to help pupils acquire those skills which they need to tackle reasoning problems.