Low threshold high ceiling tasks

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?

Can you put these shapes in order of size? Start with the smallest.

Sort the houses in my street into different groups. Can you do it in any other ways?

How many different triangles can you draw which each have one dot in the middle?

The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?

Noah saw 12 legs walk by into the Ark. How many creatures did he see?

How many different triangles can you make on a circular pegboard that has nine pegs?

Can you find examples of magic crosses? Can you find all the possibilities?

Choose four different digits from 1-9 and put one in each box so that the resulting four two-digit numbers add to a total of 100.