systems. As decimal fractions may be learned much easier than vulgar, and are more simple, useful, and necessary, and soonest wanted in more useful branches of Arithmetic, they ought to be learned first, and Vulgar Fractions omitted, until further progress in the science shall make them necessary. It may be well to obtain a general idea of them, and to attend to two or three easy problems therein : after which, the scholar may learn decimals, which will be necessary in the reduction of curremcies, computing interest and inany 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 Arithmetic than Reduction, and often discourages them. I have therefore placed a few problems in Fractions, according to the method above hinted; and after going through the principal mercantile rules, have treated upon Vulgar Fractions at large, the scholar being now capable of going through them with advantage and ease. In Simple Interest, in Federal Money, I have given several 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 measuring 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 be expected; errors of the press, or perhaps of the author, may have escaped correction. If any such are pointed out, it will be considered as a mark of friendship and favor, by The public's most humble NATHAN DABOLL. Alligation Coins of the United States, Weights of rage. Rule of Three Direct, do. Inverse Rules, for reducing the different currencies of the several United States, also Canada and No- va-Scotia, each to the par of all others 96, 97 Short Practical, for calculating Interest for finding the contents of Superfices & Solids 220 to reduce the currencies of the different Rebate, A short method of finding the, of any giv- 217 Addition, Subtraction, and Multiplication 10 showing the number of days from any day of one inonth, to the same day in any otizer showing the amount of 11. or 1 dollar, at 5 & 6 per cent. Compound Interest, for 20 years 232 showing the amount of 11. annuity, forborne for 31 years or under, at 5 and 3 per ceat. showing the present worth of 11. annuity, for 31 yrs. at 5 & 6 per c. Compound Interest ib. of cents, answering to tlie currencies of the United States, with Sterling, &c. showing the value of Federal Money in Useful Forms in transacting business Weights of several pieces of English, Portuguese, & French, gold coins, in dollars, cts. & mills 234 do. do. is. $. d. 30 90 96 Hundreds of Millions. Tens of Millions. 000 Millions. co voor A Thousands. d. d. 20 is 1 8 12 is I 2 6 24 2 40 3 4 3 50 4 2 48 4 60 5 0 60 5 70 5 10 72 6 80 6 8 84 7 7 6 8 100 8 4 108 9 110 92 120 10 120 10 0 132 11 8 kap 6 5 4 S 2 9 8 7 6 5 4 3 9 8 7 6 5 4 9 8 7 6 5 9 8 7 6 make 9 8 7 4 farthings 1 penny, dr 9 8 12 pence, 1 shilling 1. 9 20 shillings, 1 pound, f.!. 9 ADDITION AND SUBTRACTION TABLE. 12 . 3 | 4 | 5 6 71.8! 9 10 | 11 | 12 2 4 | 5 61 7 8 9 | 10 11 | 12 | 13 | 14 31 51 6 1 7 . 8 I 9 | 10 | 11 | 12 | 13 | 14 | 15 41617181.9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 5 7 | 8 | 9 | 10 | 11 | 12 13 | 14 | 15 | 16 | 17 61 81 9 10 | 11 | 12 | 15 14 | 15 | 16 | 17 | 18 71 9 | 10 | 11 | 12 | 18 | 14 | 15 | 16 | 17 | 18 | 19 81 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 To learn this Table : Find your multiplier in the left hand column, and the multiplicand a-top, and in the Connon angle of meeting, or against your multiplier, the right hand, and under your multiplicar, 0: Win and the product, or answer. |