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This challenge is to find as many ways as possible of making 12 using three number cards and the add, subtract and multiply signs.

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3 dinosaurs laid some eggs. They laid 19 altogether. How many did they each lay?

Can you put the numbers 1 to 9 in the diagram so that the difference between each pair of joined numbers is odd?

This time you can decide the total for the sides of the triangle.

A development of the 'Caterpillar investigation' but using multiples of 10. Great for practising addition.

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