# The Teachers' Assistant, Or, A System of Practical Arithmetic: Wherein the Several Rules of that Useful Science are Illustrated by a Variety of Examples : a Large Proportion of which are in Federal Money ...

Thomas Davis, 1845 - 198 СЕКъДЕР

### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### пЕЯИЕВЭЛЕМА

 Exchange 122 Vulgar Fractions 129 Decimal Fractions 144 Involution 155 A general Rule for extracting the Roots of 162
 Position 168 Geometrical Progression 174 Annuities at Compound Interest 181 Permutation 187 Promiscuous Questions 193

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 111 - From the last amount, subtract the given principal, and the remainder will be the compound interest. EXAMPLES.
сЕКъДА 37 - And every other thirty-one, Except the second month alone, Which has but twenty-eight in fine, Till leap year gives it twenty-nine.
сЕКъДА 83 - M 420 1200 4. If 10 bushels of oats be sufficient for 18 horses 20 days, how many bushels will serve 60 horses 36 days, at that rate ?
сЕКъДА 129 - A vulgar fraction is a part, or parts of a unit or integer expressed by two numbers, placed one above the other, with a line drawn between them; as -i one fourth, f two thirds.
сЕКъДА 131 - Operations with Fractions A) To change a mixed number to an improper fraction, simply multiply the whole number by the denominator of the fraction and add the numerator.
сЕКъДА 22 - FRACTIONS, or broken numbers, are expressions for any assignable parts of an unit ; and are represented by two numbers, placed one above the other, with a line drawn between them. The number above the line is called the numerator, and that below the line the denominator.
сЕКъДА 33 - Troy Weight. 24 grains (gr.) - 1 pennyweight (dwt.) 20 pennyweights — 1 ounce (oz.) 12 ounces — 1 pound (1b.).
сЕКъДА 165 - CASE 2. \ . When the prices of several simples are given, to find how much of each, at their respective rates, must be taken to make a compound or mixture at any proposed price.
сЕКъДА 157 - Subtract the square number from the left hand period, and to the remainder bring down the next period for a dividend. III. Double the root already found for a divisor ; seek how many times the divisor is contained...
сЕКъДА 78 - If a staff 4 feet long cast a shade (on level ground) 7 feet long, what is the height of a steeple whose shade at the same time is 198 feet? Ans.