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number system
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Article

Why the answer to any sum is 10

Learning mathematics involves a progression to higher and higher concepts, building on the foundations of what we have already learnt. But Andrew Irving and Ebrahim Patel explain that no matter how high your mathematical knowledge reaches you must never lose sight of your foundations, no matter how basic they may seem.
Article
rainbow colours

Colouring by numbers

How does a computer understand the colours to be displayed on the monitor's screen? It's all about red, green and blue and numbers written in a special way.

Article
numbers

The fabulous positional system

Chris Hollings reveals that our number system, much used but rarely praised, is in fact a work of genius and took millennia to evolve.

Article

Editorial

The Plus anniversary year — A word from the editors

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