# Introduction to The National Arithmetic: On the Inductive System Combining the Analytic and Synthetic Methods in which the Principles of the Science are Fully Explained and Illustrated : Designed for Common Schools and Academies

Robert S. Davis, 1849 - 324 σελίδες

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### Περιεχόμενα

 NotATION AND NuMERATION 7 ADDITION Mental Exercises 16 Subtraction Mental Exercises 26 MULTIPLICATIon Mental Exercises 34 Division Mental Exercises 46 CoNTRActions IN MULTIPLICATION 59 UNITED STATEs Money 67 46 78
 REDUCTION of CURRENCIES 193 CoMpound INTEREST 214 BANK Discount 220 INsur ANCE 226 Equation of PAYMENTs 232 229 252 Duodecimals 258 SECTION XL 277

 PRoPERTIES AND RELATIONs of NUM 134 FRACTIONsVulgar FRACTIONs 140 DECIMAL FRActions 181
 GeoMETRICAL PROGREssion 286 ALLIGATION 292 WEIGHTs MEAsures AND MONEY 318

### Δημοφιλή αποσπάσματα

Σελίδα 269 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Σελίδα 277 - A sphere is a solid, bounded by one continued convex surface, every point of which is equally distant from a point within, called the centre.
Σελίδα 84 - Britain. 4 farthings (qr, or far.) make 1 penny, marked d. 12 pence " 1 shilling, " s. 20 shillings " 1 pound, or sovereign, £. 21 shillings " 1 guinea. OBS. 1. It is customary, at the present day, to express farthings in fractions of a penny. Thus, 1 qr. is written ;<!;•_
Σελίδα 158 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Σελίδα 306 - To find the solidity, or volume, of a cylinder. RULE. — Multiply the area of the base by the altitude, and the product will be the solidity or volume.
Σελίδα 205 - ... farthings. (Art. 189.) RULE. — Reduce the shillings, pence, and farthings to the decimal of a pound, and annex it to the pounds ; then proceed as in United States money, and reduce the decimal in the result to a compound number. EXAMPLES FOR PRACTICE. 2. What is the interest of 26£ 10s. for 2 years, 4 months, at 5 per cent. ? Ans. 3£ Is.
Σελίδα 239 - If the extremes and one of the means are given the other mean may be found by dividing the product of the extremes by the given mean.
Σελίδα 270 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Σελίδα 239 - If the means and one of the extremes are given, the other extreme may be found by dividing the product of the means by the given extreme. Thus, if...
Σελίδα 213 - RULE. Divide the given interest by the interest of the given principal for 1 year, and the quotient will be the answer.