Page images
PDF
EPUB
[graphic]

systems. As decimal fractions may be learnei. much easier

than vulgar, and are more simple, useful, and neces. sary, and soonest wanted in more useful branches of Arithmetic, they ought to be learned first, and Vulgar Fractions omitteil, 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 currericies, computing interest and many other branches.

Besides, to obtain a thorough knowledge of Vulgar Fractions, is generally a task too hard for young scholars who have maile 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, Pebate. &c. together with a number of the most

easy a 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 coupon business of life.

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

The public's most humble
and obedient Servant,

NATHAN DABOLL.

#

[graphic]
[ocr errors]

Page.

Questy 's for exercise

209

Reduction

. 63

of Currencies, do. of Coin

89, 93

Rule of Three Direct, do. Inverse

100, 108

Double

148

Rules, for reducing the different currencies of the

several United States, also Canada and No-
va-Scotia, each to tie par of all others

96, 97
Application of the preceding

99
Short Practical, for calculating Interest

126
for casting Interest at 6 per cent.

215
for finding the contents of Superfices & Solids 220
to reduce the currencies of the different
States, to Federal Money

219
Rebate, A short method of finding the, of any give

en sum for months and days

217

Subtraction, Simple

Compound

45

Table, Numeration and Pence

9

Addition, Subtraction, and Multiplication 20

of Weight and Measure

11

of Time and Motion

13

showing the number of days from any day

of one month, to the same day in any other

month

172

showing the amount of 1l. or 1 dollar, at 5 &

6 per cent. Compound Interest, for 20 years 232

showing the amount of Il. annuity, forborne

for S1 years or under, at 5 and 6 per cert.

Compound Interest

235

showing the present worth of it. 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.

236

showing the value of Federal Money in

other currencies

237

Tare and Trett

Useful forms in transacting business

33

Weights of several pieces of English, l'ortuguese,

& French, gold coins, in dollars, cis. & mills

of English & Portuguese gold, vio.

of French and Spanish mild,

[ocr errors]
[ocr errors]
[ocr errors]

DABOLL'S

SCHOOLMASTER'S ASSISTANT

ARITHMETICAL TABLES

Nurneration Table

rence Table

$. d.

coHundreds of Millions.)

co Tens of Millions.
co v oHundreds of Thousands

O Millions.

ovo a Tens of Thousands, O voor Thousands.

d.

d. 8. 20 is 1 8 12 is 1 30 2 6 24 2 40 3 4 56 3 50 4 2 48 60

5 0 60 5 70 5 10 72 6 80 6 8 84 7 90 7 6 96 8 100 8 4 108 9 110 9 2 120 10

120 10 0 13% 11
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

mane
9 8 7 4 farthings 1 penny

d 9 8 12 pence, 1 shilling, $.

9 20 Shillings, 1 pound, l.

9

ADDITION AND SUBTRAOTION TABLE.

2 3 | 4 | 5 | 6 | 7 | 8 | 9 10 | 11 | 12 2 4 | 5 6 | 7 | 8 | 9 | 10 | 11 | 12 13 14 3 | 5| 617| 8 9 | 10 11 | 12 | 13 | 14 | 15 4 | 6 | 7 | 8 9 | 10 | 11 | 12 | 13 | 14 | 15 16 5 17 8 | 9 | 10 | 11 | 12 | 15 14 15 | 16 | 17 6 8 9 10 | 11 1% | 15 | 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

1

[blocks in formation]

1 21 3 | 4 | 5 | 6 | 7 8, 9; 101 111 12 24;

6 | 8 10 12 14 16 18; 201 221 24 31 6 9 | 12 | 15 | 18 21 | 24 | 27 | 30 331 36 41 8!

12 | 16 | 20 | 24 : 28 | 32 36 401 44 48 5 10 15 20 25 30 | 35 | 40 45 50 55 60 6 : 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 661 72 7:14 | 21 | 28 | 35 | 42 | 49 | 56 | 63 | 701 771 844 8| 16 | 24 | 39 | 40 | 48 | 56 | 04 | 72 | 801 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 12 | 24 30 48 60172 | 84 | 96 | 108 1204132|144

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 band, and under your multiplicand, you will find the product, or answer.

« PreviousContinue »