Required materials: cork board, little pins, rubber bands.
Put pins randomly on a cork board, and then surround them with the rubber bands to see which shapes you can make. Help your child to name them - rhombus, trapezoid, square, rectangle, circle, triangle. Encourage the child to make some of the shapes - it is great for developing fine motor skills. By using it with older children (primary school age) you can easily explain them the whole concept of perimeter and surface area. Here's how we've done it:
A dear friend of mine suggested we could use it for learning letters as well:
Warning: This really is a 3 + toy , because the pins are very small and extremely dangerous if swallowed, so use extreme caution, especially if you have younger children below this age!
P.S. You know how I love linky parties -