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Opposite Corners Introduction Ellie Birch Opposite corners are really simple. Basically, you choose any number between 1 - 100. The only numbers that you won't be able to choose are the numbers along the bottom row (91 - 100) and the ones running down the right hand side (the multiples of 10). Look at the green lines on the diagram and you'll see that only rectangles can be made, and as they are only half squares, 2x2 Squares 1x12= 12 difference = 10 11x2= 22 difference = 10 57x68= 3876 difference = 10 67x58= 3886 difference = 10 81x92= 7452 difference = 10 91x82= 7462 difference = 10 Number in left hand corner of the box = n L)[n(n+11)] + [n+1(n+9)] En n+1 N n+10 n+11 The formula that was used in this 2x2 squares was easy to work out as all that you need to do is look at the n figures and see how the other numbers relate to them. N 2x3 squares ...

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