Category : 5th Class
LEARNING OBJECTIVES
This lesson will help you to:—
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We use numbers every day. When we get up in the morning we see the clock and read the time with numbers. We wait for our bus number to go to school. We go to our class say class 5 or 6. We learn mathematics in the school. We count money using numbers only.
Do you know, what are the numbers (0 1 2 3 4 5 6 7 8 9) which we use everywhere called? These are the Arabia.
But apart from these numbers, we use some symbols too which represent mathematical values. This numerals are the Roman numerals.
Roman numerical system uses combination of letters from Latin alphabets to present mathematical numbers.
In this chapter we shall learn about the Roman numerals.
In Roman numeral system, system, symbols are used to represent the numbers.
Rules for Roman numerals:
III. One symbol cannot be used more than thrice continuously. That is why we do not write 4 as IIII this is wrong.
For example for ten is X.
VII. If a letter repeats itself, then add the letter that many times. For example XXX = 10 + 10 + 10 =30
VIII. Only one number can be subtracted from one number. For example: It will be wrong to write 13 = IIXV (15 – 1 – 1). 13 will be written as XIII.
Real - life Examples
In some watches or clocks you can see the Roman numerals on the dial.
Here are a few examples of some Roman numerals:
III. 303 = CCCIII
Here are a few Table of Roman Numbers for Numbers 1-20
No. |
Roman Representation |
No. |
Roman Representation |
1 |
I |
11 |
XI |
2 |
II |
12 |
XII |
3 |
III |
13 |
XIII |
4 |
IV |
14 |
XIV |
5 |
V |
15 |
XV |
6 |
VI |
16 |
XVI |
7 |
VII |
17 |
XVII |
8 |
VIII |
18 |
XVIII |
9 |
IX |
19 |
XIX |
10 |
X |
20 |
XX |
Some Other Important Roman Representations
L |
C |
D |
M |
50 |
100 |
500 |
1000 |
EXAMPLE:
CM (1000-100) = 900
Here are some easy ways to remember some of the Roman representations:
If we do half of symbol C we get a shape which resembles the letter representing 50 which is L
So now you are able to recognize and use the roman numerals.
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