Page 12 - Mathematics_Std_4

Example 1

Write the following numerals in Roman numbers:

(a) 14 (b) 17 (c) 19
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Solution
(a) 14 = X + IV (b) 17 = X + VII

= XIV = 17
Therefore, 14 is XIV. Therefore, 17 is XVII.

(c) 19 = X + IX
= XIX
Therefore, 19 is XIX.

Example 2

Convert the following into numerals:
(a) XII (b) XV (c) XVIII

Solution

(a) XII = 10 + 2 (b) XV = 10 + 5
= 12 = 15

Therefore, XII is 12. Therefore, XV is 15.

(c) XVIII = 10 + 8

= 18
Therefore, XVIII is 18.

Exercise 2

1. Write the Roman number with the highest value in the
following list: XII, XIII, XV, XIX, XVI, XVII, XVIII and XIV.

2. Write the following Roman numbers in words:
(a) XIV (b) XVI (c) XX (d) XI (e) XV (f) XIX

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