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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 270
by Daniel W. Fish - 1883 - 352 pages

## Progressive Arithmetic, Book 3

William James Milne - Arithmetic - 1906 - 364 pages
...united. Thus, II represents 2 ; XXX, 30 ; VI, 6 ; DC, 600. 2. When a letter is followed by a letter of greater value, its value is to be taken from that...the greater. Thus, IV represents 4 ; IX, 9 ; XL, 40 ; CD, 400. 3. A letter with a bar placed over it represents a thousand times as much as it does without...

## The New Business Arithmetic: A Treatise on Commercial Calculations

Orville Marcellus Powers - Business mathematics - 1906 - 384 pages
...be added to that of the greater. Thus, VI represents 6 ; XV, 15 ; XXI, 21 ; DC, 600 ; DCX, 610. 3. When a letter is placed before one of greater value, its value is to be taken from the greater. Thus, IX represents 9 ; XL, 40 ; XC, 90 ; CD, 400. 4. When a letter of any value is' placed...

## The New Business Arithmetic: A Treatise on Commercial Calculations

Orville Marcellus Powers - Business mathematics - 1906 - 384 pages
...is to be added to that of the greater. Thus, VI represents 6; XV, 15; XXI, 21; DC, 600; DCX, 610. 3. When a letter is placed before one of greater value, its value is to be taken from the greater. NEW BUSINESS ARITHMETIC 4. When a letter of any value is placed between two letters, each...

## Progressive Arithmetic, Complete, Books 2-3

William James Milne - Arithmetic - 1907 - 616 pages
...be united. Thus, II represents 2; XXX, 30; VI, 6; DC, 600. 2. When a letter is followed by a letter of greater value, its value is to be taken from that...the greater. Thus, IV represents 4 ; IX, 9 ; XL, 40 ; CD, 400. 3. A letter with a bar placed over it represents a thousand times as much as it does without...

## The Gilbert Arithmetics, Book 3

Charles H. Gleason, Charles Benajah Gilbert - Arithmetic - 1910 - 288 pages
...represents 2; VI, 6 ; XXX, 30; XV, 15; LX, 60 ; CX, 110; DC, 600. (2) When a letter is followed by a letter of greater value, its value is to be taken from that...the greater. Thus, IV represents 4; IX, 9; XL, 40; XC,90; CD, 400; CM, 900. (3) Placing a dash over a letter multiplies its value by 1,000. Thus, V represents...

## Preston-Stevens Standard Arithmetic, Book 2

DeForest A. Preston, Edward Lawrence Stevens - Arithmetic - 1910 - 380 pages
...notation is based upon four principles as follows: 1. Repeating a letter, repeats its value. 2. If a letter is placed before one of greater value, its value is to be taken from the value of the greater. 4. If a letter is placed between two letters, each of greater value, its...

## Milne's New York State Arithmetic, Book 2

William James Milne - Arithmetic - 1914 - 524 pages
...10 + 2, or 12. 2. When a letter is followed by a letter of greater value, the value of the less is taken from that of the greater. Thus, IV represents 4; IX, 9; XL, 40; CD, 400. Just as XII stands for 10 + 2, or 12, so XIX stands for 10 + 9, or 19. 3. A letter with a...

## Arithmetic by Grades: Third-fourth year

William A. Campbell, Thomas Houghton Hughes - Arithmetic - 1917 - 340 pages
...When a letter is placed after one of greater value, its value is added to that of the greater: XI=X+I. When a letter is placed before one of greater value, its value is taken away from that of the greater: IX = XI. 1. Read: IV IX XXV XXXIV L XL LX XLVI XLI XXVII LXXV...