Mathematical Reasoning and Investigation

Online version of the resource: https://oercollective.caul.edu.au/mathematical-reasoning-investigation/ 

Mathematical Reasoning and Investigation is designed to help you develop the ability to use mathematics to solve the kinds of problems that don't come with answers in the back of the book. We like to think of it as a mathematics book for people who think they're not good at mathematics. The work will be useful for anyone wanting to develop their own skills in reasoning and problem solving using mathematics, and for teachers and preservice teachers hoping to help their students to develop these same skills. 

Attribution:  Mathematical Reasoning and Investigation by Simon James and Chris Rawson, illustrated by Erin Cheffers (Deakin University) CC BY NC 4.0 International License,