LESSON I. Notation is writing numbers ; Numeration is reading them. Numbers are written or expressed by words, by figures, and by capital letters. The Arabic method of expressing numbers by figures is used in all arithmetical computations. Ten figures are used, viz., the figure one (1), the figure two (2), the figure three (3), the figure four (4), the figure five (5), the figure six (6), the figure seven ), the figure eight (8), the figure nine (9), and the cipher (0); each of which expresses as many units as its name indicates. These ten figures are called the arithmetical alphabet. The Roman method of expressing numbers by letters is used in numbering the chapters of books, sections, &c. Seven letters are used, viz., I, V, X, L, C, D, and M. The letter I expresses one ; V, five; X, ten; L, fifty ; C, one hundred ; D, five hundred; and M, one thousand. All numbers can be expressed by these ten figures, or seven letters, by combining and repeating them, which will be shown to some extent in the following lessons : LESSON II. One 1 I. Two 2 II. Three 3 III. Four 4 IV. Five 5 V. Six 6 VI. Seven 7 7 VII. Eight 8 8 VIII. Nine 9 IX. Ten 10 X. Eleven 11 11 XI. 9 Twenty-five LESSON IV. 25 2.5 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 35 35 36 36 XXV. XXVI. XXVII. XXVIII. XXIX. XXX. XXXI. XXXII. XXXIII. XXXIV. Xxxv. XXXVI. XXXVII. XXXVIII. XXXIX. XL. XLI. Thirty-seven Thirty-eight Thirty-nine Forty Forty-one Forty-two Forty-three Forty-four Forty-five Forty-six Forty-seven Forty-eight LESSON V. 37 37 38 38 39 39 40 40 41 42 42 43 43 44 44 45 45 46 46 47 47 48 48 XLII. XLIII. XLIV. XLV. XLVI. XLVII. XLVIII. XLIX. L. LI. LII. LIII. Forty-nine LESSON VI. 49 49 50 50 51 51 52 52 53 53 54 54 55 55 56 56 57 57 58 58 59 59 LIV. LV. LVI. LVII. LVIII. LIX. LXI. Sixty-one Sixty-two Sixty-three Sixty-four Sixty-five Sixty-six Sixty-seven Sixty-eight Sixty-nine Seventy Seventy-one Seventy-two LESSON VII. 61 61 62 62 63 63 64 64 65 65 66 66 67 67 68 68 69 LXII. LXIII. LXIV. LXV. LXVI. LXVII. LXVIII. 69 LXIX. Seventy-three 78 LXXIII. LXXIV. LXXV. LXXVI. LXXVII. LXXVIII. LXXIX. LXXX. LXXXI. LXXXII. LXXXIII. LXXXIV. Eighty-five LESSON IX. 85 LXXXV. 86 86 LXXXVI. 87 87 LXXXVII. 88 88 LXXXVIII. 89 89 LXXXIX. 90 90 XC. XCI. 92 92 XCII. 93 93 XCIII. 94 94 XCIV. 95 95 XCV. 96 96 XCVI. 91 91 LESSON X 97 98 XCVII. XCVIII. XCIX. C. Ninety-seven 97 Ninety-eight 98 Ninety-nine 99 One hundred 99 100 101 102 103 104 105 106 107 100 One hundred and one 101 One hundred and two 102 One hundred and three 103 One hundred and four 104 One hundred and five 105 One hundred and six 106 One hundred and seven 107 CI. CII. CIII. CIV. CV. CVI. CVII. |
