Quadratic expressions in expanded and factorised form to match.
9 pairs. Answers included.
To make a class set, print each pair in different colours so that you can see them easily around the room. That way, if one gets dropped on the floor, it's easy to spot which pack it's come from.
These can also be printed 2 on 1 and students simply write down the paired references.
An ideal 'starter' activity.