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## 'Twizzle Arithmetic' printed from http://nrich.maths.org/

The arithmetic rules for twisted twizzles are the same as the
arithmetic rules for untwisted twizzles.

Twisted twizzles are a geometrical picture of complex numbers.

Untwisted twizzles represent the real numbers.

Geometrically, complex arithmetic is a natural extension of real arithmetic
because it follows the same rules.