First of all you need a Scientific calculator to "play along" I know the one in windows is adequate if you don't have one, I'm not sure what the Mac one is like but I'm sure it will be fine. I personally use a Casio Fx-7000G - it's from the 80's and it's ace - go on eBay and try and find one. I'll put a picture of it below.
Hope this helps anyone who has struggled with it.
Once you Have grasped it you can go test your skills HERE
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