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systems. As decimal fractions may be learned much easier than vilgar, and are more simple, useful, and necessiry, and soonest wanted in more useful branches of Arithmetic, they onglit to be learned first, and Vulgar Fractionis omitted, until further progress in the science shall make them ncccesary. It may be well to obtain a general idea of them, and to attend to two or three easy problems therein; alier which, the scholar may learn decimals, which will be riccessary in the reduction of currencies, computing interesi, and many other branches.

Besides, to obtain a thorough knowledge of Vulgar Fractions, is generally a task too hard for young scholars who have made no further progress in Arithunetic than Reduc.. tion, and often discourages them.

I have therefore placed a few problems in Fractions, ac cording to the method above hinted; and after going through the principal mercantile rules. have treated upon Vulgar Fractions at large, the scholar oeing now capable of going through them with advantage and ease.

In Simple Interest, in Federal Money, I have given seve: ral new and concise rules ; some of which are particularly designed for the use of the compting-house.

The Appendix contains a variety of rules for casting Interest, Rebate, &c. together with a number of the most easy and useful problems, for mcasuring superficies and solids, examples of forms commonly used in transacting business, useful tables, &c. which are designed as aids in the common business of life.

Perfect accuracy, in a work of this nature, can hardly fe expected ; errors of the press, or perhaps of the author may have escaped correction. If any such are pointer out, it will be considered as a mark of friendship and fa sour, hy

The public's most humble
and obedient Servant,

MATHAN DABOLI.

showing the value of Federal Money in other currencics, 225

Tare and Tret,

103

Useful Forms in transacting business,

226

Weights of several pieces of Englislı, Portuguese, and French

Gold Coins, in dollars, cents, and mulls,

222

of English and Portuguese Gold, do. do. 223

of French and Spanish Gold, do. do. 223

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S. d.

Ilmudreds of Madona. coco Teus nf Millions.

co y Alillions. 000 v Ilundreds of Thousands.

voor Tens of Thousands. OVO OT A Thousands.

d.

d. S. 20 is 1 8 12 is ] 30 2 6 24 2 40 3 4 36 3 50 4 2 48 4 60 5 0 60 70 5 10 72 80 6 8 84 7 90 7

6 96 8 100 8 4 108 9 110 9 2 120 10 120 10 0 132. II

7 6 5 4 9 8 7 6 5 4 3 2 9 8 7 6 5 4 3 9 8 7 6 5 4 9 8 7 6 5 0 8 7 6 9 8 7 98

9

CO VOCT wo Hundreds.

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ADDITION AND SUBTRACTION TABLE

1 | 2 | 3 | 4 516171 81 9 | 10 | 11 | 12 2 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 31 51 61 71 81 9 10 | 11 | 12 | 13 | 14 | 15 4 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 5| 7 | 8 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 6 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 71 9 | 10 | 11 | 12 | 13 14 | 15 | 16 | 17 | 18 | 19 8 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 9 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 21 10 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22

MULTIPLICATION TABLE.

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | Tz 21 41 61 81 10 | 12 | 14 | 16 | 18 | 20 22 241 3161

9 | 12 | 15 | 18 | 21 | 24 | 27 | 30 | 3:31 36 4| 8 | 12 | 16 | 20 | 21 | 28 | 32 | 36 | 40 | 41 | 48 5110 | 15 | 20 | 25 | 30 | 35 | 40 | 45 50 | 55 | 60 6 | 12 | 13 | 24 | 30 | 36 42 48 | 54 | 60 | 66 | 72 7|14|21 28 35 42 | 49 | 50 | 63 701 77 84! 811624 | 32 | 40 | 48 | 56 | 61 | 72 | 80 | 88 96 911827 | 36 | 45 | 54 63 172 | 81 | 90 | 99 | 108 10 | 20 130 40 50 | 00170 | 80 | 90 | 100 | 110 | 120 11 | 22 | 33 | 44 | 55 | 66 | 77 | 88 | 99 | 110 | 121 | 1:32 12 24 36.148 | 60 1721 8196 | 108 | 120 | 132 144

To learn this Table : Find your multiplier in the len hand column, and the multiplicand a-top, and in the common angle of meeting, or against your multiplier, alony a the riglit hand, and under your multiplicand, you will fire die product, or answer.

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