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A

TREATISE

of

Common Arithmetick.

The Firſt Book


CHAP. I.

Concerning Notation of Numbers.

I.ARithmetick is the art of accompting by Number. As magnitude or greatneſſe is the ſubject of Geometry, ſo multitude of number is that of Arithmetick.

Number.II. Number is that by which every thing is numbered; or that which an-
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