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Remember that there is only one of each number from $1 - 15$.
You can download a set of cards numbered $1 - 15$ here.
How will you remember which combinations you have tried?
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?