Question: How do you find a good addition & subtraction lesson plan? 

Answer: For what age?\n\nFor the younger ones keep it concrete. For the older ones make it relevant.\n\nI love Mathsphere for worksheet resources, but I use National Numeracy unit plans for my teaching (UK - primary).\n\nTry looking up the 'National Whiteboard Network' for lesson ideas, plans and resources that use interactive whiteboards.
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