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If a letter is placed after one of greater value, its value is to be added to that of the greater. Thus, XI represents eleven, LX sixty, DC six hundred.
Fish's Arithmetic Number Two: Oral and Written, Upon the Inductive Method - Page 266
by Daniel W. Fish - 1883 - 352 pages

The Progressive Practical Arithmetic: Containing the Theory of Numbers, in ...

Horatio Nelson Robinson - Arithmetic - 1859 - 362 pages
...greater. Thus, XI represents eleven, LX sixty, DC six hundred. 3d. If a letter of any value be placed before one of greater value, its value is to be taken from that of the greater. Thus, IX represents nine, XL forty, CD four hundred. Define notation. Numeration. What systems of notation...

The Progressive Higher Arithmetic, for Schools, Academies, and Mercantile ...

Horatio Nelson Robinson - Arithmetic - 1860 - 444 pages
...greater. Thus, XI represents eleven, LX sixty, DC six hundred. 3d. If a letter of any value be placed before one of greater value, its value is to be taken from that of the greater. Thus, IX represents nine, XL forty, CD four hundred. 4th. If a letter of any value be placed between two...

A Written Arithmetic, for Common and High Schools: To which is Adapted a ...

George Augustus Walton - Arithmetic - 1864 - 364 pages
...(1.) When a letter is repeated, its value is repeated. (2.) "When a letter is placed before another of greater value, its value is to be taken from that of the greater; thus, IV denotes four. (3.) When a letter is placed after another of greater value, its value is to be added...

A Written Arithmetic, for Common and High Schools: To which is Adapted a ...

George Augustus Walton - Arithmetic - 1864 - 376 pages
...(1.) When a letter is repeated, its value is repeated. (2.) When a letter is placed before another of greater value, its value is to be taken from that of the greater; thus, IV denotes four. (3.) When a letter is placed after another of greater value, its value is to be added...

The Rudiments of Written Arithmetic: Containing Slate and Black-board ...

Horatio Nelson Robinson - Arithmetic - 1866 - 200 pages
...value is to be united to that of the greater. Thus, XI represents eleven, LX sixty, DC six hundred. value, its value is to be taken from that of the greater. Thus, IX represents nine, XL forty, CD four hundred. 4th. If a letter of any value be placed between two...

The High School Arithmetic: Containig All the Matter Usually Presented in a ...

Philotus Dean - Arithmetic - 1874 - 472 pages
...a letter repeats its value. V, L, and D are not repeated. 2o. If a letter be placed at the left of one of greater value, its value is to be taken from that of the greater. Thus, IV denotes four, IX nine, XL forty. 3o. If a letter be placed at the right of one of greater value, its...

The Complete Arithmetic: Oral and Written

Daniel W. Fish - Arithmetic - 1874 - 542 pages
...; XV. 15 ; LXX, 70 ; DC, 600. 3. When a letter is placed before one of greater value, its value is taken from that of the greater. Thus, IV represents 4 ; IX, 9 ; XL, 40 ; XC, 90. 4. When a letter of any value is placed between two letters, each of greater value, its value is taken...

First Book in Arithmetic: Including Oral and Written Exercises

Daniel W. Fish - Arithmetic - 1874 - 180 pages
...; XV, 15 ; LXX, 70 ; DC, 600. 4. When a letter is placed before one of greater value, its value is taken from that of the greater. Thus, IV represents 4 ; IX, 9 ; XL, 40 TABLE OF KOMAST NOTATION. MDCCCLXXV=1875, one thousand eight hundred and seventy-five. I = 1 XIV r=...