TEA ADDITION EACHETH to bring feveral particular numbers into one total fum, called Simple Addition, when the numbers are of one fignification; and · Compound, when of different names. Note. Saint George's Crofs fignifies Plus, or Addition; as 4 + 2 = 6 ; i. c. 4 more 2, are equal to 6 the lines between 2 and 6, denoting equality. Note. All Rules and Tables fhould be perfectly learned by heart by the young practitioner, before he is allowed to enter into them, which is effentially neceffary for the eafy performance of them. RULE. TO add any fums together, obferve that the figures are placed regularly under each other, thus, units under units, tens under tens, &c.; then begin at the unit's place, and add the loweft figure in that place to that above it, then add their fum to the next figure in the fame place, and fo on to the top-fet down the overplus above ten or tens, and for every ten carry one to the next place: fo proceed from place to place to the laft, and fet down the whole fum of the laft place. To prove Addition, reckon the figures downwards, and if the fum proves the fame, you may fuppofe it to be right. 1 TABLE. SUBSTRACTION TEA EACHETH to take a lefs number from a greater, to fhew the difference between both. Note. A ftraight line fignifies Minus, or Subftrac2 = 2, i. e. 4 less 2 are equal to 2. tion, as 4 RULE. PLACE the lefs number under the greater, units under units, tens under tens, &c. as in Addition: then begin with the unit figure of the lefs number, and put down the difference between it and the figure above it, exactly underneath; but if the lower figure is greater than the upper, add the difference between it, and 10 to the upper number; put down the unit figure of that fum, and add one to the next lowest number, and fo proceed through the whole row, but without adding one, when in the two foregoing figures the upper number is greater than the lower. To prove Subftraction, add the remainder to the lefs number, and if the fum proves the fame as the greater, it is right. TABLE |