1 I One 2 II Two 3 III Three 4 IV Four 5 V Five 6 VI Six 7 VII Seven 8 VIII Eight 9 IX Nine 10 X Ten 11 XI Eleven 12 XII Twelve 13 XIII Thirteen 14 XIV Fourteen 15 XV Fifteen 16 XVI Sixteen 17 XVII Seventeen 18 XVIII Eighteen 19 XIX Nineteen 20 XX Twenty 21 XXI Twenty-one 22 XXII Twenty-two 23 XXIII Twenty-three 24 XXIV Twenty-four 25 XXV Twenty-five 30 XXX Thirty 36 XXXVI Thirty-six 40 XL Forty 47 XLVII Forty-seven 50 L Fifty 60 LX Sixty 70 LXX Seventy 80 LXXX Eighty 90 XC Ninety 100 C One hundred 200 CC Two hundred 300 CCC Three hundred 400 CCCC Four hundred 500 D Five hundred 600 DC Six hundred 700 DCC Seven hundred 800 DCCC Eight hundred 900 DCD Nine hundred 1000 M One thousand 1100 MC One thousand one hundred 1500 MD One thousand five hundred 1812 MDCCCXII One thousand eight hundred and twelve In the above list you perceive the numeral letters are I, V, X, L, C, D, and M; the letter that stands for a smaller sum put before one that denotes a greater takes so many from it, and that after it adds so many to it. The numbers you learned long ago; but I don't think you know the numeration table, it will teach you to read any number of figures not exceeding nine: the last figure on the right hand denotes _units_, or single figures, the one before that tens, then _hundreds_, _thousands_, _tens of thousands_, _hundreds of thousands_, _tens of hundreds of thousands_, _millions_, _tens of millions_, _hundreds of millions_, now my dear read the following number, 123,456,789. _Anne._ One hundred and twenty three millions, four hundred and fifty six thousand, seven hundred and eighty nine. _Mrs. Harley._ Right; it is absolutely necessary to be able to read figures perfectly, before you can learn arithmetic. _Anne._ What is arithmetic, mamma? _Mrs. Harley._ The act of numbering, or computing by numbers, my dear. The four principal rules of arithmetic are addition, subtraction, multiplication, and division. _Anne._ I wish you would explain them to me. _Mrs. Harley._ Addition teaches to collect several numbers together in order to know their total value. The answer to a question in addition is therefore called the _sum_, _total_, or _amount_; subtraction teaches to take a less number from a greater, in order to know the remainder. The answer in subtraction is called the _remainder_, or _difference_.