ODD ONE OUT and What's in COMMON
Pattern and Design
Expressing ourselves simply

As an introduction to factors, at the earliest of stages in learning, we need to learn that there are things that are similar to one another, and things that are different from one another.

Factors can be perceived as the opposite of multiples, but I'd like us to think of using factors as a way of grouping objects together - and in getting this concept across it is easier thereafter to work in the abstract.

So to form groups, we need to be able to distinguish between items, present the notion of category, and then place objects together.

Hence I suggest games for finding the odd one out, and also looking at what is in common. Of course, at each stage of learning maths, we need to consider inclusion and behaviour - this is particularly true when working with this topic.