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'Arrow Arithmetic 2' printed from http://nrich.maths.org/

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Steffan says:
"Value of the blue arrow take away the value of the green arrow gives you the silver arrow number."

True, but what are you doing geometrically?

Here are a couple of audio/video clips showing geometrical calculations completed using the double arrow notation.

Calculation of 2 + 3 = 5

Calculation of 2 - 3 = -1