Disproof by Use of Counter Example Tutorial

Disproof by Use of Counter Example Tasks

Proof by Exhaustion Tutorial

Proof by Exhaustion Task

Proof by Direct Argument Tutorial

Proof by Direct Argument Task

Proof by Contradiction task

Proof by Contradiction Tutorial

Hollow Square

Simple Square

Magic Squares

Lewis Carroll's Pillow Problem

 

As well as being the famous author of Alice in Wonderland,
Lewis Carroll was also a keen mathematician and came up
with many problems similar to this one.

Cutting a Shape in Half

Tetrahedron

Three Consecutive Numbers

4 Consecutive Numbers

Consecutive Evens and Odd