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Pythagoras' theorem. smartphone. Circles. Visualising. Creating expressions/formulae. Area. Rectangles.

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Broad Topics > Algebra > Creating expressions/formulae

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Diagonal Sums

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?