Roman System of Counting - JSS1 Mathematics Lesson Note

The Roman numeral system is a numeral system originating in ancient Rome, using combinations of letters from the Latin alphabet: I, V, X, L, C, D, and M.

I represents 1

V represents 5

X represents 10

L represents 50

C represents 100

D represents 500

M represents 1000

Basic Rules:

If smaller numbers precede larger numbers, you subtract the smaller number.

Example: IV = 4 (5 - 1), IX = 9 (10 - 1)

If larger or equal numbers precede smaller numbers, you add the numbers.

Example: VI = 6 (5 + 1), XIII = 13 (10 + 1 + 1 + 1)

Examples of Roman Numerals:

3: III (1+1+1)

7: VII (5+1+1)

12: XII (10+1+1)

29: XXIX (10+10+(10-1))

44: XLIV (50-10)+(5-1)

68: LXVIII (50+10+5+1+1+1)

94: XCIV (100-10)+(5-1)

2023: MMXXIII (1000+1000+10+10+1+1+1)