ROMAN NUMERALS P.5

ROMAN NUMERALS

1. A) Repeated Roman numerals

Numbers with 2 and 3.

2        =       I+ I = II                                   20 = 10 + 10 = XX

3        =       I + I + I = III                            30 = 10 + 10 + 10 = XXX

200 = 100 + 100 = CC

300 = 100 + 100 + 100 = CCC

1. B) Subtraction Roman Numerals

(number with 4 and 9)

4 = (5 – 1) = IV                        40 = (50 – 10) = XL

9 = (10 – 1) = IX                       90 = (100 – 10) = XC

400 = (500 – 100) = CD             900 = (1000 – 100) = CM

1. C) Addition Roman numerals

Numbers with (6, 7 and 8)

6 = (5+1) = VI       60 = 50 + 10 = LX           600 = 500 + 100 = DC

7 = (5+2) = VII     70 = (50+20) = LXX         700 = 500 + 200 = DCC

8 = (5+3) = VIII    80 = (50 + 30) = LXXX     800 = 500 + 300 = DCCC

Examples

Write the following as Roman numerals.

1. i) 75 = 70 + 5 445 = 400 + 40 + 5

=LXX + V                                            = CD + XL + V

= LXXV                                              = CDXLV

Changing roman numerals to Hindu – Arabic

Express LXXVI in hindu – Arabic numerals

=       LXX + VI

=       70 + 6

=       76

Mzee Yokana was born in the year MCMXLII. Express this year in Hindu – Arabic.

MCMXLII = M + CM + XL + II

1000 + 900 + 40 + 2

1942

REFERENCE:        Mk bk 6 pg 50,    Mk bk 5 pg 5 – 6

                             Learning MTC standard 5, pg 11