An even number is a number that can be shared equally into two groups. For example, these 4 cubes can be shared into two equal groups of 2 cubes. So 4 is an even number. An odd number cannot be ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. Zero is a weird number. Well, not weird as in “abundant but not semiperfect” – let’s just ...