![How old am I?](/sites/default/files/styles/medium/public/thumbnails/content-99-03-six2-icon.png?itok=Y88RKpGX)
problem
How old am I?
In 15 years' time my age will be the square of my age 15 years ago. Can you work out my age, and when I had other special birthdays?
![Beelines](/sites/default/files/styles/medium/public/thumbnails/content-00-10-six6-icon.jpg?itok=VVPPDKn0)
problem
Beelines
Is there a relationship between the coordinates of the endpoints of a line and the number of grid squares it crosses?
![Which is bigger?](/sites/default/files/styles/medium/public/thumbnails/content-id-7344-icon.png?itok=Dq9q7UTS)
problem
Which is bigger?
Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?
![Multiplication arithmagons](/sites/default/files/styles/medium/public/thumbnails/content-id-7447-icon.jpg?itok=Tu0QuZpK)
problem
Multiplication arithmagons
Can you find the values at the vertices when you know the values on the edges of these multiplication arithmagons?
![Difference of Two Squares](/sites/default/files/styles/medium/public/thumbnails/content-id-11120-icon.png?itok=I6siiML4)
problem
Difference of Two Squares
What is special about the difference between squares of numbers adjacent to multiples of three?
![Square Number Surprises](/sites/default/files/styles/medium/public/thumbnails/content-id-11194-icon.jpg?itok=dQ07kz3Y)