Explore the effect of reflecting in two parallel mirror lines.
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?
Sort the houses in my street into different groups. Can you do it in any other ways?
This problem challenges you to work out what fraction of the whole area of these pictures is taken up by various shapes.
These pieces of wallpaper need to be ordered from smallest to largest. Can you find a way to do it?
