Write the numbers 1 to 9 into the squares of a 3x3 grid
so that each row and column adds up to a prime number. It does not have to be the same prime number
each time. There are 16 different
solutions. At least one solution uses
the numbers as they are placed in the example below. How many solutions can you find?
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2
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9
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7
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Helpful Hint: Draw a blank 3x3 grid. Then cut out little squares of paper with the
numbers on them so you can move them around on the grid to try different possibilities
until you find a solution.
