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 proulems therein: after which, the scholar may learn decimals, which will be necessary in the reduction of currencies, computing interst, 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 throng the principal mercantile rules, have treated upor 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 casy and useful problems, for ineasuring 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 lic 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 DABOJL. Page. . ADDITION, Simple of Federal Money Compound Annuities or Pensions, at Compound Interest Coins of the United States, Weights of 194 14 Pngere 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, 9. Short Practical, for calculating Interest 126 for finding the contents of Superfices & Solids 220 218 Rebate, A short method of finding the, of any giv- , Adition, Sabtraction, and Multiplication showing the number of days from any day of one month, to the same day in any other showing the amount of 11. or 1 dollar, at 5 & 6 per cent. Compound Interest, for 20 years 232 shewing the amount of il. anyuíty, forborne for 31 years or under, at 5 and 6 showing the present worth of 1l. annuity, for 31 yrs. at 5 & 6 per c. Compound Interest ib of cents, answering to the currencies of the United States, with Sterling, &c. showing the value of Federal Money in 937 Useful Forms in transacting business Weights of several pieces of English, Portuguse, & French, gold coins, in dollars, cents, & mills 254 of Englisk & Portuguese gold, do. du. 255 DADOLL'S SCHOOLMASTER'S ASSISTANT. ARITIMETICAL TABLES. Numeratiun Tabie, Pence Lable. 30 to Hundreds of Millions, oo Tens of Millions. DO Y Millions 1. s. d. d. S, 20 is 1 8 12 is 1 26 .94 2 40 S 4 S6 3 50 4 2 48 60 5 0 60 5 70 5 10 72 6 80 6 81 90 96 8 100 8 108 110 120 100 120 100 199 make 8 112 pence, 1 shilling, s 9:20 shillings, 1 pound, £.. ADDITION AND SUDTRAOTION TABLE, 1 2 3 4 | 5 | 6 | 7 | 8 | 9 2 4 5 67 8 9 10 11 3 5 6 7 | 8 9 10 11 12 4 | 6 7 | 8 9 | 10 | 11 12 13 5 7 8 | 9 | 10 | 11 12 13 | 14 6 | 8 9 | 10 11 12 13 14 | 15 17| 9 | 10 11 12 13 14 15 | 16 8 | 10 | 11 12 | 13 14 | 15 16 17 *9 11 | 12 | 13 14 | 15 | 16 17 | 18 10 | 12 | 13 14 | 15 | 16 | 17 18 19 10 11 | 12 12 13 | 11 13 14 15 14 15 / 16 15 16 | 17 16 | 17 | 18 17 | 18 | 19 18 19 | 20 19 20 21 20 21 | 22 MULTIPLICATION TABLE, 8 1 | 2 | 3 | 4 | 5 | 6 | 71 9 | 10 11 12 2 1 4 1 6 | 8 | 10 | 12 14 16 18 20 22 24 3; 69 | 12 | 15 | 16 | 21 | 24 | 27 30 35 36 4 8 12 16 | 20 24 | 28 | 32 | 36 40| 44 48 5 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 50 55 60 6 | 12 | 18 | 14 | 30 | 36 | 42 | 48 | 54 60, 6672 7 14 | 21 | 28 | 35 | 42 | 49 | 56 63 70 771 84 8 | 16 | 24 | 32 40 | 48 | 56 | 64 | 72 80 88 96 9 18 : 27 | 36 | 45 | 54 | 63 | 72 | 81 | 901 99|108 10 | 20 | 30 40 50 60 70 80 90 | 100/110/120 11 | 22 | 33 | 44 | 55 | 66 | 77 | 88 | 99 | 11011211132 24 36 486072 34 96 108 W0132144 To learn this Table: Find your multiplier in the left hand column, and the multiplicand a-top, and in the common angle of meeting, or against your multiplier, along at the right hand and under your multiplicand, you will find the product, or answer. |