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Decimal number

The decimal numbers 1 to 4 give the sum 10 and form the tetractys.

 

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Explanation

The tetractys is a Pythagorian figure with 10 crosses.

			X
		X		X
	X		X		X
X		X		X		X

1 + 2 + 3 + 4 = 10

The number 10 was the symbol of completion for the old Greeks.

 

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History The old Greek mathematician Pythagoras (572 BC - 500 BC) is famous for his number theory.

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