Addition with Roman Numerals

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

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.

Skill Cluster

Number Sense and Systems

Estimated Time

10 minutes

Skills Practiced

Prerequisites

• 906
• Understanding Roman Numeral Values
• Basic Addition Facts

Next Steps

• Subtraction with Roman Numerals
• Converting Roman Numerals to Arabic Numerals
• Comparing Roman Numerals
• Converting Roman Numerals