Which pairs of cogs let the coloured tooth touch every tooth on the other cog? Which pairs do not let this happen? Why?
Watch our videos of multiplication methods that you may not have met before. Can you make sense of them?
Take three consecutive numbers and add them together. What do you notice?
These points all mark the vertices (corners) of ten hidden squares. Can you find the 10 hidden squares?
A game in which players take it in turns to choose a number. Can you block your opponent?
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
Can you use the clues to complete these 5 by 5 Mathematical Sudokus?
What can you see? What do you notice? What questions can you ask?
Which of these pocket money systems would you rather have?
