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5. The Roman numbers V, L, and D cannot be subtracted

in other numbers.

6. The Roman numbers I, X, and C can be subtracted from
FOR ONLINE READING ONLY
other numbers. Therefore,

(a) I can be subtracted from V and X only, for example IV
and IX.

(b) X can be subtracted from L and C only, for example
XL and XC.

(c) C can be subtracted from D and M only, for example
CD and CM.

7. The number I, X, and C can be written by repeating up
to three times consecutively. For example; III, XXX, and

CCC.

Revision Exercise

1. Write the following Roman numbers in words:
(a) CMXC (b) DLXIV (c) CMLXXI (d) DCXCVII

2. Write the following in Roman numbers.

(a) Six hundred and twenty-one

(b) Eight hundred and fifty-five
(c) Eight hundred and eighteen

(d) Nine hundred and fifty

3. Write the following Roman numbers in words:

(a) XCI (b) CCXCII (c) DCCCLXXI (d) CMXCIX

4. The length of the road is CMXCVI kilometres. Write this
length in numerals.

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