1 added
2 removed
Original
2026-01-01
Modified
2026-02-28
1
-
<p>292 Learners</p>
1
+
<p>329 Learners</p>
2
<p>Last updated on<strong>August 5, 2025</strong></p>
2
<p>Last updated on<strong>August 5, 2025</strong></p>
3
<p>Roman numerals are a way of expressing numbers using symbols. I, V, X, L, C, D, and M are the symbols we use. Roman Numerals are used in royal titles, book names, sequences, and so on. Here we will be discussing Roman Numerals, rules, and examples.</p>
3
<p>Roman numerals are a way of expressing numbers using symbols. I, V, X, L, C, D, and M are the symbols we use. Roman Numerals are used in royal titles, book names, sequences, and so on. Here we will be discussing Roman Numerals, rules, and examples.</p>
4
<h2>What is 18 in Roman Numerals?</h2>
4
<h2>What is 18 in Roman Numerals?</h2>
5
<p>The royal titles, such as Henry I, Henry II, and so on. Have you noticed the names and wondered what these<a>symbols</a>(I and II) represented? Those are the Roman Numerals. Earlier people used to count using fingers, sticks, bones, etc., to count. When life became complex, a<a>standard form</a>was required to count. Ancient Romans used the Roman Numeral system to count. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols we use to count.</p>
5
<p>The royal titles, such as Henry I, Henry II, and so on. Have you noticed the names and wondered what these<a>symbols</a>(I and II) represented? Those are the Roman Numerals. Earlier people used to count using fingers, sticks, bones, etc., to count. When life became complex, a<a>standard form</a>was required to count. Ancient Romans used the Roman Numeral system to count. I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols we use to count.</p>
6
<p>In Roman Numerals, we use XVIII to represent 18, here X is 10, V is 5, and III is 3. Let’s learn more about Roman Numerals and how we write them.</p>
6
<p>In Roman Numerals, we use XVIII to represent 18, here X is 10, V is 5, and III is 3. Let’s learn more about Roman Numerals and how we write them.</p>
7
<p> </p>
7
<p> </p>
8
<h2>Basic Rules for 18 in Roman Numerals</h2>
8
<h2>Basic Rules for 18 in Roman Numerals</h2>
9
<p>There are certain basic rules to write a<a>number</a>in Roman Numerals. In this section, let’s discuss some basic rules that need to be remembered when writing a number in Roman numerals. </p>
9
<p>There are certain basic rules to write a<a>number</a>in Roman Numerals. In this section, let’s discuss some basic rules that need to be remembered when writing a number in Roman numerals. </p>
10
<p><strong>Rule 1: Addition Method</strong></p>
10
<p><strong>Rule 1: Addition Method</strong></p>
11
<p>The<a>addition</a>method is used when the smaller number is placed after the larger number, then it is the addition method. For example, XVIII → X + V + III → 10 + 5 + 3 = 18</p>
11
<p>The<a>addition</a>method is used when the smaller number is placed after the larger number, then it is the addition method. For example, XVIII → X + V + III → 10 + 5 + 3 = 18</p>
12
<p><strong>Rule 2: Repetition Method</strong></p>
12
<p><strong>Rule 2: Repetition Method</strong></p>
13
<p>To write a large number, there are certain Roman Numerals that can be repeated up to three times. III → 3.</p>
13
<p>To write a large number, there are certain Roman Numerals that can be repeated up to three times. III → 3.</p>
14
<p><strong>Rule 3: Subtraction Method</strong></p>
14
<p><strong>Rule 3: Subtraction Method</strong></p>
15
<p>If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number; it is a<a>subtraction</a>method. For example, IX → X - I → 10 - 1 = 9</p>
15
<p>If a small number is followed by a large number in Roman Numerals, we subtract the smaller number from the large number; it is a<a>subtraction</a>method. For example, IX → X - I → 10 - 1 = 9</p>
16
<p><strong>Rule 4: Limitation Rule</strong></p>
16
<p><strong>Rule 4: Limitation Rule</strong></p>
17
<p>The symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we won't write VV for 10; instead, we use X. For 8, we write VIII, not IIIIIIII. </p>
17
<p>The symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we won't write VV for 10; instead, we use X. For 8, we write VIII, not IIIIIIII. </p>
18
<h2>How to Write 18 in Roman Numerals</h2>
18
<h2>How to Write 18 in Roman Numerals</h2>
19
<p>Let’s now learn how to write 18 in Roman Numerals. Follow these methods to write the number in Roman Numerals.</p>
19
<p>Let’s now learn how to write 18 in Roman Numerals. Follow these methods to write the number in Roman Numerals.</p>
20
<p>By Expansion Method By Grouping Method </p>
20
<p>By Expansion Method By Grouping Method </p>
21
<h3>Explore Our Programs</h3>
21
<h3>Explore Our Programs</h3>
22
-
<p>No Courses Available</p>
23
<h2>18 in Roman Numeral by Expansion Method</h2>
22
<h2>18 in Roman Numeral by Expansion Method</h2>
24
<p>In the expansion method, based on the<a>place value</a>, the number is broken down. In this section, we will learn how to write 18 in Roman numerals using the expansion method. </p>
23
<p>In the expansion method, based on the<a>place value</a>, the number is broken down. In this section, we will learn how to write 18 in Roman numerals using the expansion method. </p>
25
<p>To write 18 in Roman Numerals, follow the steps:</p>
24
<p>To write 18 in Roman Numerals, follow the steps:</p>
26
<p><strong>Step 1:</strong>The number is broken based on the place value. Place value that is ones, tens, hundreds, etc.</p>
25
<p><strong>Step 1:</strong>The number is broken based on the place value. Place value that is ones, tens, hundreds, etc.</p>
27
<p>For 18, we write it as 10 + 5 + 3. </p>
26
<p>For 18, we write it as 10 + 5 + 3. </p>
28
<p><strong>Step 2:</strong>Converting the number into Roman Numerals </p>
27
<p><strong>Step 2:</strong>Converting the number into Roman Numerals </p>
29
<p>10 in Roman Numerals - X 5 in Roman Numerals - V 3 in Roman Numerals - III </p>
28
<p>10 in Roman Numerals - X 5 in Roman Numerals - V 3 in Roman Numerals - III </p>
30
<p><strong>Step 3:</strong>Combining the Roman Numerals together.</p>
29
<p><strong>Step 3:</strong>Combining the Roman Numerals together.</p>
31
<p> Therefore, 18 in Roman Numerals is X (10) + V (5) + III (3) = XVIII </p>
30
<p> Therefore, 18 in Roman Numerals is X (10) + V (5) + III (3) = XVIII </p>
32
<h2>18 in Roman Numeral by Grouping Method</h2>
31
<h2>18 in Roman Numeral by Grouping Method</h2>
33
<p>When writing a large number into Roman Numerals, we group the number.</p>
32
<p>When writing a large number into Roman Numerals, we group the number.</p>
34
<p> To write 18 in Roman Numerals, we group 18 as 10 + 5 + 3. </p>
33
<p> To write 18 in Roman Numerals, we group 18 as 10 + 5 + 3. </p>
35
<p>10 in Roman Numerals - X 5 in Roman Numerals - V 3 in Roman Numerals - III </p>
34
<p>10 in Roman Numerals - X 5 in Roman Numerals - V 3 in Roman Numerals - III </p>
36
<p>So, 18 is written as XVIII in Roman Numerals.</p>
35
<p>So, 18 is written as XVIII in Roman Numerals.</p>
37
<h2>Common Mistakes and How to Avoid Them in 18 Roman Numerals</h2>
36
<h2>Common Mistakes and How to Avoid Them in 18 Roman Numerals</h2>
38
<p>Students make mistakes when writing a number in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and the ways to avoid them. </p>
37
<p>Students make mistakes when writing a number in Roman Numerals. To master Roman Numerals, we can learn a few common mistakes and the ways to avoid them. </p>
39
<h3>Problem 1</h3>
38
<h3>Problem 1</h3>
40
<p>A history museum has XVIII artifacts to display each day. If they plan to show these artifacts over IX days, how many artifacts will be displayed each day?</p>
39
<p>A history museum has XVIII artifacts to display each day. If they plan to show these artifacts over IX days, how many artifacts will be displayed each day?</p>
41
<p>Okay, lets begin</p>
40
<p>Okay, lets begin</p>
42
<p>The number of artifacts displayed each day is II. </p>
41
<p>The number of artifacts displayed each day is II. </p>
43
<h3>Explanation</h3>
42
<h3>Explanation</h3>
44
<p>To find how many artifacts are displayed each day, we divide the total number of artifacts by the number of days.</p>
43
<p>To find how many artifacts are displayed each day, we divide the total number of artifacts by the number of days.</p>
45
<p>That is XVIII / IX</p>
44
<p>That is XVIII / IX</p>
46
<p>XVIII = 18 IX = 9 Therefore, XVIII / IX = 18 / 9 = 2.</p>
45
<p>XVIII = 18 IX = 9 Therefore, XVIII / IX = 18 / 9 = 2.</p>
47
<p>2 in Roman numerals can be written as II.</p>
46
<p>2 in Roman numerals can be written as II.</p>
48
<p>Well explained 👍</p>
47
<p>Well explained 👍</p>
49
<h3>Problem 2</h3>
48
<h3>Problem 2</h3>
50
<p>A puzzle requires rearranging the letters of "EIGHTEEN" into a grid with VI rows, with the same number of letters in each row. How many letters will each row contain?</p>
49
<p>A puzzle requires rearranging the letters of "EIGHTEEN" into a grid with VI rows, with the same number of letters in each row. How many letters will each row contain?</p>
51
<p>Okay, lets begin</p>
50
<p>Okay, lets begin</p>
52
<p>Each row will contain III letters.</p>
51
<p>Each row will contain III letters.</p>
53
<h3>Explanation</h3>
52
<h3>Explanation</h3>
54
<p>The word "EIGHTEEN" has 8 letters. To find how many letters each row contains, divide the total number of letters by the number of rows.</p>
53
<p>The word "EIGHTEEN" has 8 letters. To find how many letters each row contains, divide the total number of letters by the number of rows.</p>
55
<p>VIII / VI = 8 / 6 = 1 remainder 2.</p>
54
<p>VIII / VI = 8 / 6 = 1 remainder 2.</p>
56
<p>Since the grid must be filled evenly, each full row will have III letters, and two additional rows will have one extra letter each. </p>
55
<p>Since the grid must be filled evenly, each full row will have III letters, and two additional rows will have one extra letter each. </p>
57
<p>Well explained 👍</p>
56
<p>Well explained 👍</p>
58
<h3>Problem 3</h3>
57
<h3>Problem 3</h3>
59
<p>Calculate the sum of the Roman numerals IX and IX.</p>
58
<p>Calculate the sum of the Roman numerals IX and IX.</p>
60
<p>Okay, lets begin</p>
59
<p>Okay, lets begin</p>
61
<p>The sum of IX and IX is XVIII.</p>
60
<p>The sum of IX and IX is XVIII.</p>
62
<h3>Explanation</h3>
61
<h3>Explanation</h3>
63
<p>Sum is the result of adding two numbers.</p>
62
<p>Sum is the result of adding two numbers.</p>
64
<p>IX = 9 IX = 9 9 + 9 = 18</p>
63
<p>IX = 9 IX = 9 9 + 9 = 18</p>
65
<p>18 in Roman Numerals is XVIII.</p>
64
<p>18 in Roman Numerals is XVIII.</p>
66
<p>The sum of IX and IX is XVIII.</p>
65
<p>The sum of IX and IX is XVIII.</p>
67
<p>Well explained 👍</p>
66
<p>Well explained 👍</p>
68
<h3>Problem 4</h3>
67
<h3>Problem 4</h3>
69
<p>What is the difference between XX and II?</p>
68
<p>What is the difference between XX and II?</p>
70
<p>Okay, lets begin</p>
69
<p>Okay, lets begin</p>
71
<p>The difference between XX and II is XVIII.</p>
70
<p>The difference between XX and II is XVIII.</p>
72
<h3>Explanation</h3>
71
<h3>Explanation</h3>
73
<p>The difference of two numbers is the value we get when subtracting one number from another.</p>
72
<p>The difference of two numbers is the value we get when subtracting one number from another.</p>
74
<p>XX = 20 II = 2 20 - 2 = 18</p>
73
<p>XX = 20 II = 2 20 - 2 = 18</p>
75
<p>18 in Roman Numerals can be written as XVIII.</p>
74
<p>18 in Roman Numerals can be written as XVIII.</p>
76
<p>Well explained 👍</p>
75
<p>Well explained 👍</p>
77
<h3>Problem 5</h3>
76
<h3>Problem 5</h3>
78
<p>Write the Roman Numeral for 9 + 9 using the expansion method.</p>
77
<p>Write the Roman Numeral for 9 + 9 using the expansion method.</p>
79
<p>Okay, lets begin</p>
78
<p>Okay, lets begin</p>
80
<p>The Roman numeral for 9 + 9 is XVIII. </p>
79
<p>The Roman numeral for 9 + 9 is XVIII. </p>
81
<h3>Explanation</h3>
80
<h3>Explanation</h3>
82
<p>First convert the numbers 9 and 9 into Roman numerals.</p>
81
<p>First convert the numbers 9 and 9 into Roman numerals.</p>
83
<p>9 - IX 9 - IX</p>
82
<p>9 - IX 9 - IX</p>
84
<p>Add the numbers together: 9 + 9 = 18</p>
83
<p>Add the numbers together: 9 + 9 = 18</p>
85
<p>Using the expansion method: 18 = 10 + 8 = XVIII.</p>
84
<p>Using the expansion method: 18 = 10 + 8 = XVIII.</p>
86
<p>Well explained 👍</p>
85
<p>Well explained 👍</p>
87
<h2>FAQs on 18 in Roman Numerals</h2>
86
<h2>FAQs on 18 in Roman Numerals</h2>
88
<h3>1.What is 9 in Roman numerals?</h3>
87
<h3>1.What is 9 in Roman numerals?</h3>
89
<p>IX is 9, as it has a smaller number following a larger one using the subtraction method. That is I - X, which is 10 - 1 = 9. </p>
88
<p>IX is 9, as it has a smaller number following a larger one using the subtraction method. That is I - X, which is 10 - 1 = 9. </p>
90
<h3>2.How to write 18 in Roman numerals?</h3>
89
<h3>2.How to write 18 in Roman numerals?</h3>
91
<p>Here the larger numbers are followed by smaller ones, so we use the addition method. That is X(10) + V(5) + III(3) = 18. So, XVIII is 18. </p>
90
<p>Here the larger numbers are followed by smaller ones, so we use the addition method. That is X(10) + V(5) + III(3) = 18. So, XVIII is 18. </p>
92
<h3>3.What is 16 in Roman Numerals?</h3>
91
<h3>3.What is 16 in Roman Numerals?</h3>
93
<p>16 in Roman Numerals is written as XVI. </p>
92
<p>16 in Roman Numerals is written as XVI. </p>
94
<h3>4.Is XVIII a prime number?</h3>
93
<h3>4.Is XVIII a prime number?</h3>
95
<p>No, XVIII is not a<a>prime number</a>. Because 18 has<a>factors</a>other than 1 and 18, such as 2, 3, 6, and 9. </p>
94
<p>No, XVIII is not a<a>prime number</a>. Because 18 has<a>factors</a>other than 1 and 18, such as 2, 3, 6, and 9. </p>
96
<h3>5.What are the multiples of 18?</h3>
95
<h3>5.What are the multiples of 18?</h3>
97
<p>The<a>multiples</a>of 18 are 18, 36, 54, 72, 90, and so on. </p>
96
<p>The<a>multiples</a>of 18 are 18, 36, 54, 72, 90, and so on. </p>
98
<h2>Important Glossaries for 18 in Roman Numerals</h2>
97
<h2>Important Glossaries for 18 in Roman Numerals</h2>
99
<ul><li><strong>Addition rule:</strong>Addition method is used when a large number is followed by a smaller numeral; here the values are added. For example, XVIII = X + V + III = 10 + 5 + 3 = 18. </li>
98
<ul><li><strong>Addition rule:</strong>Addition method is used when a large number is followed by a smaller numeral; here the values are added. For example, XVIII = X + V + III = 10 + 5 + 3 = 18. </li>
100
<li><strong>Grouping method:</strong>Here the given numbers are grouped based on their place value, and then we convert each group into its Roman numerals. For example, 18 = 10 + 5 + 3 = XVIII. </li>
99
<li><strong>Grouping method:</strong>Here the given numbers are grouped based on their place value, and then we convert each group into its Roman numerals. For example, 18 = 10 + 5 + 3 = XVIII. </li>
101
<li><strong>Repetition rule:</strong>Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, III = 3 (I is repeated three times to represent the number 3). </li>
100
<li><strong>Repetition rule:</strong>Certain symbols (I, X, C, M) in the Roman numeric system can be repeated only up to three times. For example, III = 3 (I is repeated three times to represent the number 3). </li>
102
<li><strong>Subtraction rule:</strong>Subtraction method is used when a smaller number is placed before a larger numeral. For example, IX = X - I = 10 - 1 = 9. </li>
101
<li><strong>Subtraction rule:</strong>Subtraction method is used when a smaller number is placed before a larger numeral. For example, IX = X - I = 10 - 1 = 9. </li>
103
<li><strong>Roman Numeral symbols:</strong>The symbols used in the Roman numeral system are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). </li>
102
<li><strong>Roman Numeral symbols:</strong>The symbols used in the Roman numeral system are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). </li>
104
</ul><p>What Are Numbers? 🔢 | Fun Explanation with 🎯 Real-Life Examples for Kids | ✨BrightCHAMPS Math</p>
103
</ul><p>What Are Numbers? 🔢 | Fun Explanation with 🎯 Real-Life Examples for Kids | ✨BrightCHAMPS Math</p>
105
<p>▶</p>
104
<p>▶</p>
106
<h2>Hiralee Lalitkumar Makwana</h2>
105
<h2>Hiralee Lalitkumar Makwana</h2>
107
<h3>About the Author</h3>
106
<h3>About the Author</h3>
108
<p>Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.</p>
107
<p>Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.</p>
109
<h3>Fun Fact</h3>
108
<h3>Fun Fact</h3>
110
<p>: She loves to read number jokes and games.</p>
109
<p>: She loves to read number jokes and games.</p>