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### 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?

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### Beelines

Is there a relationship between the coordinates of the endpoints of a line and the number of grid squares it crosses?

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### Which is bigger?

Which is bigger, n+10 or 2n+3? Can you find a good method of answering similar questions?

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### Multiplication arithmagons

Can you find the values at the vertices when you know the values on the edges of these multiplication arithmagons?

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### Difference of Two Squares

What is special about the difference between squares of numbers adjacent to multiples of three?

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### Square Number Surprises

There are unexpected discoveries to be made about square numbers...