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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?
Is there a relationship between the coordinates of the endpoints of a line and the number of grid squares it crosses?
Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?
Can you find the values at the vertices when you know the values on the edges of these multiplication arithmagons?
What is special about the difference between squares of numbers adjacent to multiples of three?
There are unexpected discoveries to be made about square numbers...