Arithmetick vulgar, decimal, & algebraical. In a most plain and facile method for common capacities. Together with a treatise of simple and compound interest and rebate; with two tables for the calculation of the value of leases and annuities, payable quarterly; the one for simple, the other for compound interest, at 6. per cent. per annum; with rules for making the like for any other rate. To which is added a new, and most practical way of gauging of tunns. As also the art of cask-gauging, for the use of His Majesties Officers of the Excise.

The Vse of the Table.

Having any Quest. wherein Pounds, Shillings & Pence, are required to be under one denomi∣nation, viz. Pounds, and the parts of a Pound: First seek in the Column of Shillings for your Shillings, and set down the Fraction that stands against it; then in the Column of Pence, seek your Pence; in the Farthings, your Farthings; add all these together, and the Sum is the decimal Fraction desired.

Example.

What is the decimal Fraction for 17 s. 9 d. 3/4?

First as the decimal parts of a Pound seek for 17 s. and the Fraction against it in the other Column is. 85;

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Which is the Number required, and is the decimal Fraction for 17 s. 9 d. 3/4, as parts of a Pound.

Again, having a decimal Eraction in the parts of a Pound, and its desired to know the value thereof in lesser denominations: Let it be the Fraction before found, viz. .890625: I seek in the Table of Fractions for the neerest to it,

and find .85, and against it 17 s. I then set .85 down, and subduct it from the other, and there remains .040625; I look over the Table again, and find the next neerest is .0375, against it 9 d. I subduct that; and find the Remainder .003125, stand against 3 Farthings.

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So finding the value of any other decimal Fraction: If any thing remain after the last subduction, being less than a Farthing, I cast it away as of small regard.