Crack the Codes

Hey guys, we meet again! So, this maths task was kinda hard and fun. It was a really good way of learning maths as well as having fun and being related to the topic-detective all at the same time!
I enjoyed this task although the second page was sort of hard, hehe.

Why don't you look through the pages of this maths task so you can think that too!
After you do that, please leave me a positive comment :)