This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
This activity investigates how you might make squares and pentominoes from Polydron.
If you had 36 cubes, what different cuboids could you make?
There is just a need to be systematic here. Try taking the information in a different order, starting with facts that have the least number of possibilities. For example the fact about number plates with M only has two possible outcomes.