D Roman Numerals

Number	Expanded Form	Roman Numeral Expression	Final Roman Numeral
100	100	C	C
400	500 - 100	D - C	CD
500	500	D	D
600	500 + 100	D + C	DC
700	500 + 200	D + CC	DCC
800	500 + 300	D + CCC	DCCC
900	1000 - 100	M - C	CM
1000	1000	M	M

Basic Rules for Writing Roman Numerals

To write numerals like D correctly, follow these key rules:

1. Symbols are combined by addition or subtraction.

• Example: VI = 5 + 1 = 6; IX = 10 – 1 = 9.

2. The smaller numeral before the larger one indicates subtraction.

• Example: CD = 500 – 100 = 400.

3. The smaller numeral after a larger one indicates addition.

• Example: DC = 500 + 100 = 600.

4. Symbols such as V (5), L (50), and D (500) are never repeated or subtracted.

• Example: D occurs only once in any numeral.
  
  

Solved Examples

Example 1: Write 500 in Roman numerals.

• Identify the value of 500 in the Roman numeral system.

• Remember that D = 500.

• Therefore, 500 is directly represented by the symbol D.

Example 2: Convert 450 to Roman numerals.

• Divide the number into 400 + 50.

• 400 = CD (which is 500 – 100)

• 50 = L

• Add them together → CD + L = CDL

Example 3: Convert 675 to Roman numerals.

• Divide 675 by 500 + 100 + 50 + 20 + 5.

• Convert each part:

• 500 = D

• 100 = C

• 50 = L

• 20 = XX

• 5 = V

• Combine all: D + C + L + XX + V = DCLXXV

Example 4: A museum plaque shows “DCC”. What number does it represent?

• D = 500, C = 100.

• DCC = 500 + 100 + 100 = 700.

• So the Roman numeral DCC represents the number 700.

Example 5: Write 900 in Roman numerals using subtraction.

• The number 900 is 100 less than 1000.

• Write 100 as C and 1000 as M.

• Place the smaller numeral (C) before the larger one (M) to indicate subtraction.

• Therefore, 900 = CM. 
  
  

Conclusion

The Roman numeral D stands for 500 and is an important symbol in the Roman numeral system. It represents half of M (1000) and helps form larger numbers between 400 and 900. Knowing the role of D makes it easier to understand how Roman numerals combine other values ​​through addition and subtraction, such as CD (400), DC (600), and DCC (700).

FAQs on D Roman Numerals

1. What is the value of D in Roman numerals?

Answer: D represents the number 500 in Roman numerals.

2. Can the letter D be repeated in Roman numerals?

Answer: No, symbols such as D, V, and L cannot be repeated with Roman numerals.

3. What comes before and after D in Roman numerals?

Answer: Before D is CD (400), and after D is DC (600).

4. Why does D stand for 500 in Roman numerals?

Answer: D represents half of 1000 (M). In early Roman inscriptions, the letter was derived from a symbol that looked like half of an "M".

5. How do you write 900 in Roman numerals using D?

Answer: 900 is written as CM, where C (100) is placed before M (1000) to show subtraction.