Page 10 - Mathematics_Std_4

When a smaller Roman number is written to the right of a Roman
number which is equal or greater in its value, the resulting number
is obtained by adding the values of those numbers.

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Example 1

Write the following Roman numbers in numerals:

(a) II (b) VI (c) VII (d) VIII

Solution

(a) II =1+1 (b) VI = 5 + 1

= 2 = 6
Therefore, II is 2. Therefore, VI is 6.
(c) VII = 5 + 2 (d) VIII = 5 + 3

= 7 = 8
Therefore, VII is 7. Therefore, VIII is 8.

A Roman number with a smaller value written to the left of a
Roman number with a greater value is obtained by subtracting
the value of the smaller number from the greater number.

Example 2

Write the following Roman numbers in numerals:
(a) IV (b) IX

Solution

(a) IV = 5 – 1 (b) IX = 10 – 1
= 4 = 9

Therefore, IV is 4. Therefore, IX is 9.

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MATHEMATICS STD 4 PB 2024.indd 3
MATHEMATICS STD 4 PB 2024.indd 3 06/11/2024 17:16:55