![](https://d1e4pidl3fu268.cloudfront.net/db77103d-f1f1-4527-9cc7-b743000b29b2/cover.crop_680x510_6,0.preview.png)
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.
Something went wrong, please try again later.
This resource hasn't been reviewed yet
To ensure quality for our reviews, only customers who have downloaded this resource can review it
Report this resourceto let us know if it violates our terms and conditions.
Our customer service team will review your report and will be in touch.