Extract from Stereometry; or the Art of GAUGING made easie, by the Help of a Sliding-Rule by Tho. Everard (1727) p 31

Sect. I.

Problem IV.

To reduce a Vulgar Fraction into a Decimal.

Set the Denominator (of the Vulgar Fraction given) upon A, to the Numerator thereof upon B, and then against 1 towards the left hand upon B, is the Decimal Fraction sought.

    So 1/4 will be found equal to this Decimal (viz.) .25: For,

    As 4 upon A, is to 1 upon B; So is 1 upon A, to .25 upon B.

    Also 21/28 will be .75; for As 28 upon A, is to 21 upon B; So is 1 upon A, to .75 upon B.

   In like manner this Vulgar Fraction (viz.) 582/960 is equal to this Decimal, viz. .60625; for set 960 upon A, to 582 upon B, then against 1 upon A, is .60625 upon B; and so for any other.


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This page was last updated on 29 March 2000.