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Number Grid Investigation Aim: My aim is to find out how the number of rows and columns in a square, on a certain sized grid will affect the difference between the product of the top left number and the bottom right number in the square subtracted from the top right number and the bottom left number. Prediction: I predict that when you've got numbers in a square box in a 10 by 10 grid, the difference will always be a square number because the box is shaped as a square. Method: Firstly, I'm going to work out the difference, in a 2 by 2 square in a 10 by 10 grid, between the two products that I get from multiplying the top left number and the bottom right number in the square by the top right number and the bottom left number. I am then going to repeat this another 3 times...

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