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Educational video for children in which they will learn the rules for using Roman numerals. The Roman numeral system is made up of seven capital letters and each letter has a numerical value. To know the order in which they are written, the first thing to know is that Roman numerals are written and read from left to right and from highest to lowest value. The first rule to know is that if there is a letter of equal or lower value to the right of a letter, the value of that letter is added to the previous one, that is, the two letters are added to form a number. Another rule is that, in the same number, some letters can be repeated up to three times, while others cannot be repeated. Another rule is that when a letter of lower value is written to the left of a letter of higher value, we must subtract the lower number from the higher one. Finally, to form thousands, we will put the number in letters, with a straight line through its letters. This video is a very useful and interesting resource for children. It is perfect for teaching the rules for using Roman numerals. This is an excellent video for elementary school. Welcome to the Smile and Learn educational channel! If you want children to smile and learn, this is your channel. SUBSCRIBE! You will discover unique, fun and educational material for children aged 3 to 12. You can find stories with values, videos with educational content (geography, history, letters, science, etc.), videos about emotions, yoga… And much more! All videos and stories come from our Smile and Learn educational app platform. For more information, go to www.smileandlearn.com and DOWNLOAD the app, you won't regret it! www.smileandlearn.com