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Second/Roman Numerals

Addition with Roman Numerals

Convert Roman numerals, add them, and write the sum.
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Study Guide

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Practice Questions

  1. I + I = ?
    Show answer

    II

  2. I + II = ?
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    III

  3. V + I = ?
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    VI

  4. V + II = ?
    Show answer

    VII

  5. X + V = ?
    Show answer

    XV

Teacher Resources
Teaching Notes

Two methods: 1. Convert to standard, add, convert back. 2. Group symbols (II + III = V). Method 1 is safer for beginners.

Vocabulary
Sum: The result of addition.
Operation: A mathematical process like addition.
Common Mistakes
  • Misinterpreting subtractive principle
  • Incorrect value for symbols
  • Ordering symbols incorrectly
  • Adding Arabic instead of Roman
Differentiation
SupportProvide a Roman numeral conversion chart.
ChallengeInclude larger sums or subtractions.
Discussion Questions
  • Why are Roman numerals still used today?
  • How is this system different from ours?
  • What are the challenges of adding Roman numerals?
  • Can you create a problem for a friend?
Extension Activities
  • Add three Roman numerals.
  • Create addition word problems.
  • Use larger Roman numerals.
Parent Tip

Use household objects to represent Roman numerals and practice adding them.

Learning Path
Skill Cluster

Number Sense and Systems

Estimated Time

10 minutes

Skills Practiced
Recognize roman patterns