Page 236 263 279 F.volution, or the extracting of Roots, 217 Extraction of the Square Root, Rules for the square root of Vulgar Fractions and mix- Application and use of the Square Root, Application and use of the Cube Root, Extraction of the Biquadrate Root, of the furfolids by approximation, A general rule for extracting the Roots of all Powers, 237 Comillion, or Fa storage, 393 Discount by Compound Intereit, 207 Aonaties, or Pensions in arrears at Compound Interest, 308 Present worth of annuities, at Compound Interest, 3FI Annuities in Reversion, at Compound Interest, 314 Table shewing the amount of £1 from one year to 40, 319 Thewing the present worth of £r from a year to 40, 320 --thewing the amount of £i annuity, hewing the present worth of Li annuity, 322 -hewing the annuity which £ I will purchase, 323 Double Polition, 33.4 Permutations and Combinations, directing to buy and fell by the Hundred Weight, 347 --to reduce Troy to Avoirdupois, to reduce Avoirdupois to Troy, ABRIDGED. A RITHMETICK is the Art or Science of com puting by numbers, and is comprised under five priocipal or fundamental Rules, viz. NOTATION or Nua MERATION, Addition, SUBTRACTION, MULTIPLICA. Fion and Division, NUMERATION Teaches the different value of figures by their different places and to read or write any sum or number by these ten characters, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Lo is called a cypher, and all the rest are called figures or digits. 2. Befides the simple value of figures as above noted, they have each a local value, according to the follow, ing law ; viz. In a combination of figures, reckoning from right to left, the figrire, in the first place represents its primitive simple value ; that in the second place, ten. times its simple yalue, and so on the value of the figdure, in each succeeding place, being tea times the value of it, in that immediately preceding it. 3. The values of the places are estimated according to their order : the first is denominated the place of units;. the second, tens : the third, hundreds, and so on, as in, the Table. Thus, in the number 3467": 7 in the first place, fignifies only seven; 6 in the second place, figni-fies 6. tens, or fixty ; 4, in the third place, four hundreds 3, in the fourth place, three thousand ; and the whole, taken together, is read thus ; three thousand four huadred and fixty feven. 4. А 4. A cypher, though of no significa tion itself, yet it poffefies a place, and when fet on the right hand of figures, in whole numbers, increases their value in the same tenfold proportion ; this, 9 fignifies only nine ; but, if a cypher is placed on its right hand, thus, go, it then becomes ninety, To enumerate any parcel of figures, observe the fol lowing Rule. First, Commit the words at the head of the Table viz. units, tens, handreds, &c. to memory ; then, to the fimple value of each figure, join, the name of its place, beginning at the left hand, and reading towards the right-More particularly-1. Place a dot under the right hand figure of the ad, 4th, 6th, 8th, &c. half periods, and the figure over such dot will, universally, have the name of thousands.2. Place the figures 1, 2, 3, 4, &ça as iodices, over the 2d, 3d, 4th, &c. period : Thefe indices, will then show the number of times the millions are involved the figure under 1, bearing the name of millions, that under 2, the name of billions (or millions of millions) that under 3, trillions (or millions of milljons of millioos.) ti. un. th.. tr. the un.. thi un. tb. un. th. An, CX..É.X.4. 3 1 943, 208;000, 341,620, 0573219. 356;809 379;1 20, 406;129.763 Thousands Thousands Thousands Ri{ a Thousands lel a Thousands Thousands Thousands NOTE NOTE T. Billions is substituted for millions of mill ions ; Trillions, for millions of millions of millions : Quatrillions, for millions of millions of millions of millions. Quintillions, Sextillions, Septillions, Octillions, Nonmillions Decillions, Undecillions, Duodecillions &c. an. fwer to millions fo often involved as their indices respec• tively denote. NOTE 2 The right hand figure of each half period has the place of units, of that half period ; the middle onė, that of tens, and the left hand one, that of hun. dreds. 1 THE APPLICATION. Write down, in proper figures, the following numlers. Fifteen. nine. Eight hundred millions, fourty four thousand, and fifty five. Two thousand, five hundred and forty three millions, four hundred and thirty one thousand, seven hundred and two Write down in words at length, the following numbers. 8 437 709040 3476194 7584397647 17 3010 879066 84094007 49163189186 129 **gáso6 4091875 690748591 500098422700 Notution Notation by Roman Letters. 1. One ÅL. Forty. 14. Two. L. Fifty. III. Three. LX. Sixty. IV. Four. LXX. Seventy. V. Five. LXXX. Eighty VI. Six. XC. Ninety. VII. Seven. C. Hundred VIII, Eight. CC. Two Hundred. IX. Nine. CCC. Three Hundred. CCCC. Four Hundred. 1. Fifty Thousand. XIX. Nineteen. 1ɔɔɔlɔɔɔ. Five hund. thou. XX. Tweaty. MDCCCVII. One thousand XXX. Thirty. eight hundred and seven. A less literal number, placed after a greater, always augments the value of the greater ; if put before, it di. minishes it. Thus, VI is 6; IV is 4 ; XI is ir ; 1X is 9, &c. ADDITION Is the putting together of two or more numbers, or fums, to make them one total, or whole fum. SIMPLE ADDITION r Is the adding of several integers or whole numbers ikie gether, which are all of one kind, or fort ; as, 7 pour 1 2 pounds and 20 pounds, being added together, the. gregate, or sum total, is 39 pounds. |