MATHS MYSTERY(Code breaker)

For this weeks Maths Mystery Challenge we had to crack multiple codes and I think that it was pretty fun. I think that the hardest part for me would have to be the 3rd slide because although it was pretty easy I accidentally got one of the letters wrong, but I ended up noticing it at the end so I fixed it.

I think that the easiest part was the last slide because it was just + and - so I worked it all out really well, although it was easy I still thought that it was really, really fun and so where all of the other questions.
I think that this would have to be my favourite Maths Mystery because it was a little bit easier then all of the other Maths Mystery.
These are my slides.