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VABLL'S

SCHOOLMASTER'S ASSISTANT.

IMPROVED AND ENLARGED.

BEING A

PLAIN PRACTICAL SYSTEM

OF

ARITHMETICK.

ADAPTED TO

TIIE UNITED STATES.

BY NATHAN DABOLL.

WITÜ THE ADDITION OF THE

FARMERS' AND MECHANICKS' BEST

METHOD OF BOOK-KEEPING,

DESIGNED AS A

COMPANION TU DABOLL'S ARITHMETICK.

BY SAMUEL GREEN.

ITHACA, N. Y.,
PRINTED AND DUBLISUED BY MACK, ANDRUS AND WOODRIFR

Entered according to act of Congress, in the year 1825, by SanUEL GREEN, in the Clerk's Office of the district of Connecticut,

52744 RECOMMENDATIONS.

6-12.945

Yale College, Nov. 27, 1799. I have read DABOLL's SchoolMaster's Assistant. The arrangement of the different branches of Arithmetic is judicious and perspicuous. The author has well explained Decimal Arithmetic, and has applied it in a plain and elegant manner in the solution of various questions, and especially to those relative to the Federal Computation of money. I think it will be a very useful book to Schoolmasters and their pupils. JOSIAH MEIGS, Professor of Mathematics

and Natural Philosophy. [Now Surveyor-General of the United States.]

I have given some attention to the work" above mentioned, and concur with Mr. Professor Meigs in his opinion of its merit.

NOAH WEBSTER. New Haven Dec. 12, 1799.

Rhode-Island College, Nov. 30, 1799. I have run through Mr. DABOLL's SchoolMaster's Assistant, and have formed of it a very favourable opinion. According to its original design, I think it well " calculated to furnish Schools in general with a methodical, easy, and comprehensive System of Practical Arithmetic." I therefore hope it may find a generous patronage, and have an extensive spread. ASA MESSER, Professor of the Learned Languages,

and teacher of Mathcmalics. (Now Presiilent of that lasliturinn.)

Plainfield Academy, April 20, 1802 I MAKE 18C of DABOLL'S SCHOOLMASTER's Assistant in teaching common Arithmetic, and think it the best calculated for that purpose of any which has fallen within my observation. JOIN ADAMS,

Rector of Plainficld Academy. (Now Principal of Philips' Academy, Andover, Mass.)

Billerica Academy, (Mass.) Dec. 10, 1807. Hlaving examined Mr. DABOLL': System of Arithmetic, I am pleased with the judgment displayed in his method, and the perspicuity of liis explanations, and thinking it as easy and comprehensive a system as any with which I am acquainted, can cheerfully recommend it to the patronage of instructers.

SAMUEL WAITING,

Teacher of Mathematics,

From Mr. Kennedy, T'cacher of Mathematics. I BECAME acquainted with DABOLL'S SCHOOL MASTER'S Assistant, in the year 1802, and on examining it atteiltively, gave it my decisive preference to any other system extant, and immediately adopted it for the pupils under my charge; and since that time have used it exclusively in elementary tuition, to the great advantage and improvement of the student, as well as the ease and assistance of the preceptor. I also deem it equally well calculateal for the benefit of individuals in private instruction; and thinks it my duty to give the labour and ingenuity of the author the tribute of my licarty approval and recommendation."

ROGER KENNEDY New-York, March 20, 1811.

PREFACE.

THE design of this work is to furnish the schools of the A mited States with a methodical and comprehensive system of Practical Arithmetic, in which I have endeavoured, through the whole, to have the rules as concise and familiar as the nature of the subject will permit.

During the long period which I have devoted to the instruction of youth in Arithmetic, I have made use of various systems which have just claims to scientific merit; but the uvthors appear to have been deficient in an important point-the practical teacher's experience. They have been foo sparing of examples, especially in the first rudiments; in consequence of which, the young pupil is hurried through the ground rules too fast for his capacity. This objection I have endeavoured to obviate in the following treatise.

In teaching the first rules, I have found it best to encourage the attention of scholars by a variety of easy and fimiliar questions, which might serve to strengthen their minds as their studies grew more arduous.

The rules are arranged in such order as to introduce the most simple and necessary parts, previous to those which are more abstruse and difficuit.

To enter into a detail of the whole work would be tc. dious; I shall therefore notice only a few particulars, and refer the reader to the contents.

Although the Federal Coin is purely decimal, it is so nearly allied to whole numbers, and so absolutely necessary to be understood by every one, that I have introduced it iminediately after addition of whole numbers, and also shown how to find the value of goods therein, immediately after simple multiplication ; which may be of great adventage to many, who perhaps will not have an opportunity el learning fractions.

In the arrangement of fractions, I have taken in new method, the adva; tages and faclity of W susficiently apologizo fr its not beling the

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