merous illustrations are given showing the exact size of the metric weights and measures and the relation of their units to each other. In the operations the process of simplifying by cancellation, whereby much time and labor is saved, is kept constantly in view. In the processes of Commission, Interest, Banking, Equation of Payments, etc., business men and bankers have been consulted, and those methods adopted that experience has proved to be the simplest and the best. Only such tables of compound numbers have been given in the body of the work as are used in ordinary transactions. Circulating Decimals, Annual Interest, Foreign Exchange, Custom House Business, Arithmetical and Geometrical Progression, and Alligation, not being required in the grammar school grade, have been placed in the Appendix. Additional tables, monetary equivalents of different countries, rates of interest in the several States, and other matter of this nature used mainly for reference, are also given in the Appendix. The author desires to return his thanks to those teachers who have so freely aided him with suggestions and examples. His obligations are specially due to Mr. L. A. Wheelock, Master of the Rice School, Boston, Mr. James A. Page, Master of the Dwight School, Boston, and Mr. L. M. Chase, Master of the Dudley School, Boston, for valuable assistance. W. F. B. CONTENTS. Definitions ...... Notation and Numeration ......... 1 Division ... COMMON FRACTIONS, pp. 73 – 101. 73 | Multiplication of Fractions....... 83 Reduction of Fractions.. Addition of Fractions.... 80 Miscellaneous Oral Examples..... 91 Subtraction of Fractions. 81 | Miscellaneous Written Examples 95 Numeration of Decimals......... 102 | Division of Decimals. Multiplication of Decimals...... 103 | Reduction to Decimals. COMPOUND NUMBERS, pp. 134 – 159. 134 | Multiplication of C. Numbers... 149 .134 – 142 | Division of Compound Numbers 150 Tables, Appendix ... Reduction Compound Numbers 142 Miscellaneous Oral Examples... 153 Addition Compound Numbers 146 Miscellaneous Written Examples 154 PERCENTAGE, pp. 160–228. Definitions and Problems... 160-167 | Present Worth and Discount... 192 Profit and Loss.... Insurance Commission and Brokerage...... 173 Bank Discount... 174 | Equation of Payments. 209 Plane Figures..... Quadrilaterals 258 | Miscellaneous Written Examples 268 Notation and Nuneration ...... 332 | Annual Interest..... Contractions in Multiplication 334 Vermont Rule..... Contractions in Division........... 335 New Hampshire Rule. Divisibility of Numbers.. 336 Foreign Exchange... Table of Prime Numbers... 337 | Customs ... Greatest Common Divisor.... 338 Square Root... G. C. D. of Fractions.. 340 Arithmetical Progression...... 365 Circulating Decimals.. 340-344 Geometrical Progression.... 368 Tables......... Leap Years.... Rates of Interest in States...... 349 | Mapshowing Stand'd Time Sect's 377 ARITHMETIC. 1. A Unit is a single thing of any kind; as, one day, one book. 2. A Number is a unit, or a collection of units; as, six days, ten books. 3. A Concrete Number is a number that is applied to a particular object; as, six books, ten men, four days. 4. An Abstract Number is a number that is not applied to any particular object; as, six, ten, seventeen. 5. Arithmetic is the science of numbers, and the art of computation. NOTATION AND NUMERATION. 6. Notation is the writing of numbers. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine. 9. The first figure is called zero, a cipher, or naught; standing alone, it signifies nothing. The remaining nine figures represent in order the numbers one, two, three, four, five, six, seven, eight, nine. 10. No number greater than nine can be expressed by a single figure, but by repeating the figures, and arranging them differently, all numbers may be represented. 11. Ten is expressed by writing the figure 1 at the left of the cipher; thus, 10. In like manner, twenty, thirty, forty, etc. , are expressed by placing 2, 3, 4, etc., at the left of 0; thus, 20, 30, 40, 50, 60, 70, 80, 90. Twenty, Thirty, Forty, Fifty, Sixty, Seventy, Eighty, Ninety. 12. The numbers from 10 to 20 are expressed by placing the figure 1 at the left of each of the ten figures except zero; thus, 11, 12, 13, 14, 15, 16, 17, etc. Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, etc. In a similar manner all the numbers up to one hundred may be written; thus, 13. One hundred is expressed by placing the figure 1 at the left of two ciphers; thus, 100. In like manner two hundred, three hundred, etc., are written; thus, 300, 200, Two hundred, 600, 800, etc. Six hundred, Eight hundred, etc. Three hundred, 14. The other numbers up to one thousand may be expressed by putting another figure in the place of one, or in the place of each, of the two ciphers; thus, Two hundred three, expressed in figures, is 203, Six hundred eighty, expressed in figures, is 680, Nine hundred ninety-eight, expressed in figures, is 998. |