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"What does it take to learn the Index Laws? Surprisingly little if you (i) can fold a piece of paper (ii) can multiply by two. I first observed my head teacher do a version of this lesson last year with his Year 7 class, and had the joy of doing a more advanced version with my Year 9 this year. I have a feeling the idea goes back to the dawn of maths teaching, but I haven't seen a resource explaining it, so thought it would be fun to share my take on it."