These squares have been made from Cuisenaire rods. Can you describe
the pattern? What would the next square look like?
Cut differently-sized square corners from a square piece of paper
to make boxes without lids. Do they all have the same volume?
Can you use this information to work out Charlie's house number?
Can you discover which year De Morgan was born in?
Do you think anyone living at this time can say the same thing
about their age and the year they were born? (That
doesn't mean that they have to have been born the same year as De
This is a cartoon of De Morgan drawn by one of his students.