Task from textbook (p98 Brainworks No. 12)

(a) Explain a quick way to calculate the sum of the 9 numbers.

(b) Let n be the number at the top left hand corner of the rectangle. Express the sum of the 9 numbers in terms of n.

(c) Let m bet he middle number in the rectangle. Express the sum of the 9 numbers in terms of m.

(d) Write down an equation relating m and n.

(e) Describe some other interesting properties about the numbers within the rectangle.

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