Flashcards for:
Math Antics - Roman Numerals
What is the rule if you need to add the same symbol more than 3 times in a row?
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Switch to the next biggest numeral and subtract from that instead.
What is the system used by the Ancient Romans for counting?
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The system is called 'Roman Numerals'.
What is the basis of the number system we use today?
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We use the 'Hindu-Arabic Numerals' system today.
How do the Roman Numerals for 1, 5, and 10 look?
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The Roman Numerals for 1, 5, and 10 look like 'I', 'V', and 'X', respectively.
How is the Roman system of counting initially similar to tally marks?
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It begins with using vertical lines for 1, 2, and 3, much like tally marks.
What is the Roman Numeral for 4 and 6?
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The Roman Numerals for 4 is 'IV' and for 6 is 'VI'.
What are the basic rules for determining the value of Roman Numerals?
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If a numeral of lesser value comes before a numeral, it is subtracted; if it comes after, it is added.
How do the Romans usually write the number 9?
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The number 9 is usually written as 'IX', meaning '1 less than 10'.
What numeral did the Romans use for zero?
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They didn't have a numeral for zero, instead they wrote the word 'nulla'.
How are the numbers 11 through 20 written in Roman Numerals?
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They are written by adding the numerals for 1 through 10 after 'X', such as XI, XII, XIII, and so on up to XX for 20.
What is the Roman Numeral for 50, and how does it help avoid repeating the numeral 'X' multiple times?
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The Roman Numeral for 50 is 'L', and it's used to write 40 as 'XL' (10 less than 50) to avoid repeating 'X' more than three times.
How would the Romans write the number 90?
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They would write 90 as 'XC', meaning '10 less than 100'.
What symbols did the Romans use for 500 and 1000?
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They used 'D' for 500 and 'M' for 1000.
How would you write the year 2024 in Roman Numerals?
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2024 would be written as 'MMXXIV'.
How can the number 365 be written in Roman Numerals?
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365 can be written as 'CCCLXV'.
What are some important limitations of the Roman Numeral system?
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The symbols for 5, 50, and 500 are not repeated or subtracted, and 1 can only be subtracted from 5 or 10, 10 from 50 or 100, and 100 from 500 or 1000.
Why aren't Roman Numerals used as much today?
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Roman Numerals are complex and have limitations, making them less practical than modern numeral systems.
What is the rule if you need to add the same symbol more than 3 times in a row?
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Switch to the next biggest numeral and subtract from that instead.
What is the system used by the Ancient Romans for counting?
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The system is called 'Roman Numerals'.