This is a macro-enabled spreadsheet to use as a hook for introducing algebraic proofs (or just so you can convince pupils that you can read their minds!).
It’s fun to have the entire class do the activity and reveal which symbol they were all thinking of on a mini white board. Do it a few times and some will start to see the pattern with multiples of 9s, which leads nicely on to first explaining and then proving why the answer will always be a multiple of 9.
I have also included a short video to show an example of me using it.
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