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2026-01-01
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2026-02-28
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<p>214 Learners</p>
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<p>INDONESIA - Axa Tower 45th floor, JL prof. Dr Satrio Kav. 18, Kel. Karet Kuningan, Kec. Setiabudi, Kota Adm. Jakarta Selatan, Prov. DKI Jakarta</p>
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<p>Last updated on<strong>August 5, 2025</strong></p>
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<p>INDIA - H.No. 8-2-699/1, SyNo. 346, Rd No. 12, Banjara Hills, Hyderabad, Telangana - 500034</p>
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<p>To meet their daily commerce and administration needs, the ancient Romans developed Roman Numerals. It used a combination of seven symbols - I, V, X, L, C, D, and M to represent numbers. Roman numerals were used to record transactions, keep track of data, and label military units. In this topic, we are going to learn about the Roman numeral CDXVIII.</p>
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<p>SINGAPORE - 60 Paya Lebar Road #05-16, Paya Lebar Square, Singapore (409051)</p>
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<h2>What is CDXVIII in Roman Numerals?</h2>
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<p>USA - 251, Little Falls Drive, Wilmington, Delaware 19808</p>
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<p>The ancient Romans discovered that counting on fingers could get very complicated after 10. To overcome this complexity, the Roman numeric system was developed. This system was widely used throughout Europe as a standard writing system until the late Middle Ages.</p>
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<p>VIETNAM (Office 1) - Hung Vuong Building, 670 Ba Thang Hai, ward 14, district 10, Ho Chi Minh City</p>
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<p>Seven<a>symbols</a>are used to represent<a>numbers</a>in the Roman numeric system - I, V, X, L, C, D, and M. The numerals are made up<a>of</a>different<a>combinations</a>of these symbols.</p>
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<p>VIETNAM (Office 2) - 143 Nguyễn Thị Thập, Khu đô thị Him Lam, Quận 7, Thành phố Hồ Chí Minh 700000, Vietnam</p>
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<p>CDXVIII in Roman numerals can be written in number form by adding and subtracting the values of each Roman numeral,<a>i</a>.e. CDXVIII = 418. Let us learn more about the Roman numeral CDXVIII, how we write them, the mistakes we usually make, and ways to avoid these mistakes.</p>
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<p>UAE - BrightChamps, 8W building 5th Floor, DAFZ, Dubai, United Arab Emirates</p>
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<h2>Basic Rules for CDXVIII in Roman Numerals</h2>
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<p>UK - Ground floor, Redwood House, Brotherswood Court, Almondsbury Business Park, Bristol, BS32 4QW, United Kingdom</p>
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<p>When writing Roman numerals, there are a few rules that we need to follow based on the Roman numerals we are trying to write. In this section, we will learn about the rules when writing Roman numerals and how to represent them.</p>
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<h3>Rule 1: Addition Method:</h3>
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<p>When a larger symbol is followed by a smaller symbol, we add the numerals to each other. For example, in VIII, we have 5 + 3 = 8.</p>
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<h3>Rule 2: Repetition Method:</h3>
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<p>A symbol that is repeated increases the value of the numeral. For example, XXX = 30.</p>
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<h3>Rule 3: Subtraction Method:</h3>
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<p>We use the<a>subtraction</a>method when a larger symbol follows a smaller symbol. For example, XL = 40 (which is 50 - 10).</p>
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<h3>Rule 4: Limitation Rule:</h3>
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<p>Symbols cannot be repeated more than three times, and some symbols, such as V, L, and D, cannot be repeated more than once. For example, 10 is represented as X and not VV.</p>
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<h2>How to Write CDXVIII in Roman Numerals?</h2>
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<p>Let us learn about how to write CDXVIII in Roman numerals. There are two methods that we can use to write Roman numerals:</p>
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<ul><li>By Expansion Method</li>
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<li>By Grouping Method</li>
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</ul><h3>Explore Our Programs</h3>
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<p>No Courses Available</p>
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<h2>CDXVIII in Roman Numeral by Expansion Method</h2>
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<p>The breaking down of Roman numerals into parts and then converting them into numerals is what we call the expansion method. The expansion method is the breaking down of Roman numerals into numerical form and adding or subtracting them to get the final number.</p>
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<p><strong>Step 1:</strong>Break the Roman numerals into parts.</p>
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<p><strong>Step 2:</strong>Now write each of the Roman numerals with its numerical digit in the<a>place value</a>.</p>
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<p><strong>Step 3:</strong>Add or subtract the numerals together.</p>
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<p>For CDXVIII,</p>
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<p><strong>Step 1:</strong>First, we break the Roman numerals. CDXVIII = CD + X + V + III</p>
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<p><strong>Step 2</strong>: Write the Roman Numerals for each part</p>
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<p>The Roman Numeral CD is 400</p>
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<p>The Roman Numeral X is 10</p>
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<p>The Roman Numeral V is 5</p>
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<p>The Roman Numeral I is 1</p>
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<p><strong>Step 3:</strong>Combine all the numbers CD + X + V + III = 400 + 10 + 5 + 3 = 418.</p>
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<p>Therefore, the Roman Numeral CDXVIII is 418.</p>
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<h2>CDXVIII in Roman Numeral by Grouping Method</h2>
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<p>Using subtraction and<a>addition</a>rules, we will apply the grouping method. This means we break the Roman numerals into smaller groups, which makes it easier to work with. This method groups the Roman numerals logically, and then we write the numbers for each group.</p>
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<p><strong>Step 1:</strong>Take the largest number and write the number for that Roman numeral.</p>
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<p><strong>Step 2:</strong>Write the Roman numeral using the subtraction and addition rules.</p>
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<p>Example: Let’s take the Roman numeral CDXVIII.</p>
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<p><strong>Step 1:</strong>The larger Roman numerals are what we will begin with. Once split, the Roman numerals we get are CD, X, V, and III. The numeral for CD is 400</p>
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<p><strong>Step 2:</strong>Now we need to either add or subtract the smaller number, depending on its place. Here we add X, V, and III to CD and we will get CDXVIII.</p>
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<p>The Roman numeral X is 10</p>
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<p>The Roman numeral V is 5</p>
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<p>The Roman numeral III is 3</p>
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<p>Therefore, the numeral of CDXVIII is 418.</p>
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<h2>Common Mistakes and How to Avoid Them in CDXVIII Roman Numerals</h2>
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<p>Students can make mistakes when studying Roman numerals. Here are a few common mistakes students make, and ways to avoid them.</p>
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<h3>Problem 1</h3>
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<p>If a library has CDXVIII books and acquires another C books, how many books does it have in total? Write the answer in Roman numerals.</p>
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<p>Okay, lets begin</p>
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<p>The total number of books is DXVIII</p>
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<h3>Explanation</h3>
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<p>Convert both Roman numerals into their decimal form:</p>
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<p>CDXVIII = 418</p>
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<p>C = 100</p>
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<p>Now add both numbers: 418 + 100 = 518</p>
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<p>Now convert the number into its Roman numeral: 518 = 500 (D) + 18 (XVIII) = DXVIII</p>
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<p>Well explained 👍</p>
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<h3>Problem 2</h3>
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<p>A treasure chest contains CDXVIII gold coins. After removing XXXIX coins, how many coins are left? Write in Roman numerals.</p>
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<p>Okay, lets begin</p>
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<p>The remaining coins are CCCLXXIX</p>
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<h3>Explanation</h3>
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<p>Convert the Roman numerals into their decimal form:</p>
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<p>CDXVIII = 418</p>
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<p>XXXIX = 39</p>
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<p>Now subtract the numbers: 418 - 39 = 379</p>
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<p>Convert the number into its Roman numeral: 379 = 300 (CCC) + 70 (LXX) + 9 (IX) = CCCLXXIX</p>
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<p>Well explained 👍</p>
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<h3>Problem 3</h3>
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<p>An ancient scroll is CDXVIII years old. If it was restored 3 times, each restoration occurring every century, what is its age during the last restoration? Write the answer in Roman numerals.</p>
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<p>Okay, lets begin</p>
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<p>CDXVIII</p>
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<h3>Explanation</h3>
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<p>Convert CDXVIII into its decimal form:</p>
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<p>CDXVIII = 418</p>
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<p>Since each restoration occurs every 100 years, it remains 418 years old during the restorations.</p>
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<p>Well explained 👍</p>
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<h3>Problem 4</h3>
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<p>A historical event occurred CDXVIII years ago and another event occurred XXX years ago. How many years apart were these events? Write the answer in Roman numerals.</p>
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<p>Okay, lets begin</p>
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<p>CCCLXXXVIII</p>
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<h3>Explanation</h3>
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<p>Convert the Roman numerals into their decimal form:</p>
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<p>CDXVIII = 418</p>
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<p>XXX = 30</p>
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<p>Now subtract the numbers: 418 - 30 = 388</p>
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<p>Convert the number into its Roman numeral: 388 = 300 (CCC) + 80 (LXXX) + 8 (VIII) = CCCLXXXVIII</p>
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<p>Well explained 👍</p>
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<h3>Problem 5</h3>
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<p>Convert CDXVIII into its decimal form.</p>
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<p>Okay, lets begin</p>
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<p>In decimal form, CDXVIII is 418</p>
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<h3>Explanation</h3>
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<p>Break CDXVIII into components:</p>
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<p>CD = 400 (500 - 100)</p>
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<p>XVIII = 18 (10 + 5 + 3)</p>
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<p>Add values: 400 + 18 = 418</p>
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<p>Well explained 👍</p>
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<h2>FAQs on CDXVIII in Roman Numerals</h2>
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<h3>1.What is XVIII in Roman numerals?</h3>
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<p>The Roman numeral XVIII in numerical form is 18.</p>
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<h3>2.Is CDXVIII a prime number?</h3>
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<h3>3.What is CDXVIII + CDXVIII?</h3>
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<p>CDXVIII(418) + CDXVIII(418) = DCCCXXXVI (836).</p>
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<h3>4.What is CXXVIII?</h3>
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<p>CXXVIII in modern numbers is 128.</p>
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<h3>5.Subtract XVIII from CDXVIII</h3>
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<p>CDXVIII(418) - XVIII(18) = CD(400).</p>
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<h2>Important Glossaries for CDXVIII in Roman Numerals</h2>
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<ul><li><strong>Limitation Rule:</strong>Some symbols cannot be repeated more than once (V, L, D). For example, writing LL for 100 is wrong, the correct answer is C.</li>
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</ul><ul><li><strong>Place Value:</strong>The position of a digit in a number, this position determines its value. For example, the number 4 in 418 is in the hundred's place.</li>
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</ul><ul><li><strong>Subtraction Method:</strong>A Roman numeral rule where a smaller numeral before a larger numeral means subtracting the smaller from the larger. For example, IV for 4.</li>
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</ul><ul><li><strong>Addition Method:</strong>A Roman numeral rule where numerals are added if a smaller numeral follows a larger numeral. For example, VI for 6.</li>
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</ul><ul><li><strong>Numerical Expansion:</strong>The breaking down of a number into its constituent parts for easier calculation or understanding. For example, CDXVIII as CD + X + V + III.</li>
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</ul><p>What Are Numbers? 🔢 | Fun Explanation with 🎯 Real-Life Examples for Kids | ✨BrightCHAMPS Math</p>
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<p>▶</p>
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<h2>Hiralee Lalitkumar Makwana</h2>
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<h3>About the Author</h3>
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<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>
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<h3>Fun Fact</h3>
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<p>: She loves to read number jokes and games.</p>