NOTATION AND NUMERATION, 37. Two tens of thousands, five thousands, no hundreds no tens, sis unite. 38. Three thousands, four hundreds, no tens, and six units. 39. Four tens of thousands, two thousands, no hundred, no tens, and no units. 40. Three hundreds of thousands, four tens of thousande, one thousand, five hundreds, six tens and three units; or three hundred and forty-one thousands, five hundred and sixty-three. 41. Five millions, three hundreds of thousands, six tens of thousands, no thousands, three hundreds, one ten, no uits. 42. Six millions. 43. Four tens of millione, five millions, no hundreds of thousands, eight tens of thousands, three thousands, no hun- dreds, two tens, and six units. 44. Eight hundreds of millions, seven tens of millions, no millions, seven hundreds of thousands, four tens of thous- ands, three thousands, five hundreds, seven tens, and eight units. 45. One billion, one million, and forty. 46. Forty billions, two hundred thousand, and five. 47. Seven hundred and twenty-six billions, fifty millions one thousand, two hundred and forty-three. ROMAN NOTATION. § 13. The common method of representing numbers by figures is termed the Arabic. Another method, by means of letters, is called the Roman method.
In the Roman method, the letter I stands for one; V for five; X, ten; L, fifty; C, one hundred; D, five hundred ; M, one thousand.
Numbers are represented on the following principles:
1. Every time a letter is repeated, the value of that let- ter is added. Thus: II denoté two ; III denote three; XX denote twenty; XXX thirty.
2. When a letter of less value is placed before one of greater value, the less is
