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Roman Numerals: Symbols and the Two Big Rules

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Lesson Details

Grade Level
3-5
Duration (minutes)
1
Summary
Grade 3-5 students learn the seven Roman numeral symbols (I, V, X, L, C, D, M) and the two rules that combine them: add when a smaller or equal number follows a bigger one, and subtract when a smaller number comes first. Familiar examples — clocks, movie titles, the Super Bowl — connect the concept to real life before students practice reading values like XII, IX, and XIV.

Roman numeral symbol key (I, V, X, L, C, D, M with their values) alongside two rule boxes explaining when to add and when to subtract, with worked examples.

Student Worksheet: Roman Numerals

Teacher Note: Students can watch the video lesson above and answer the questions. Click the “Teacher Answer Key” dropdown below when you are ready to review the solutions!

Key Concepts:

• The Seven Symbols: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.

• Rule 1 (Add): If a smaller or equal number comes after a bigger one, add them (VI = 5 + 1 = 6).

• Rule 2 (Subtract): If a smaller number comes before a bigger one, subtract it (IX = 10 – 1 = 9).

Instructions: Read each question carefully and write your answer in the space provided.

  1. Question 1: What are the seven Roman numeral symbols and their values?
  2. Question 2: What is the rule for when you add two Roman numerals together?
  3. Question 3: What is the rule for when you subtract in Roman numerals?
  4. Question 4: What number does XII represent?
  5. Question 5: What number does IX represent?
  6. Question 6: What number does XIV represent? Show your thinking.
Click to reveal Teacher Answer Key

1. I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000.

2. When a smaller or equal number comes after a bigger one, you add (e.g. VI = 5 + 1 = 6).

3. When a smaller number comes before a bigger one, you subtract it from the bigger one (e.g. IX = 10 – 1 = 9).

4. 12 (X + I + I = 10 + 1 + 1).

5. 9 (10 – 1).

6. 14 (X = 10, IV = 4, so 10 + 4 = 14).

Disclaimer: This worksheet was generated with AI assistance based on original video content. It is intended for educational reference only. Teachers are encouraged to review and adjust questions to fit their curriculum standards before classroom use.

🎯 Extension Activity: Have students find 3 real-world examples of Roman numerals (clocks, book chapters, movie sequels, Super Bowl numbers) and write out what number each one represents, showing their add/subtract reasoning.

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