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Forgotten Number

I have forgotten the number of the combination of the lock on my briefcase. I did have a method for remembering it...

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Man Food

Sam displays cans in 3 triangular stacks. With the same number he could make one large triangular stack or stack them all in a square based pyramid. How many cans are there how were they arranged?

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Sam Again

Here is a collection of puzzles about Sam's shop sent in by club members. Perhaps you can make up more puzzles, find formulas or find general methods.

Picturing Triangle Numbers

Stage: 3 Challenge Level: Challenge Level:1

How could you describe the rectangles that are formed?

Keep a record of your results.

How might square roots help when determining whether or not a number is a triangle number?