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'Four Go' printed from http://nrich.maths.org/
Where on the number line do you want to put a mark? How will you
make that answer from the numbers in the grid?
You could use a calculator to check your answers if your opponent
How will you stop your opponent from getting four in a line before
Are there any good places on the number line to start? Are there
some places which might not be so good to start? Why?