Writing Roman Numerals (1-399) (907)

Teaching Notes

Review place value. Break numbers down: 245 = 200 + 40 + 5 = CC + XL + V.

Vocabulary

Roman Numeral: Number system using letters like I, V, X, L, C.

Arrange: Put symbols in the correct order.

Common Mistakes

• Incorrect symbol order (e.g., IC for 99).
• Repeating subtractive symbols (e.g., IIX).
• Using too many repeated symbols (e.g., IIII for 4).
• Misunderstanding subtraction rule application.

Differentiation

Extension Activities

• Write large numbers in Roman numerals.
• Challenge friends with Roman numerals.
• Research Roman numeral history.

Parent Tip

Ask your child to write a year (e.g., 2023) in Roman numerals.

Skill Cluster

Number Sense

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• 905
• Understanding number values (1-400)
• Basic number comparison and ordering

Next Steps

• Converting larger numbers to Roman numerals
• Reading Roman numerals
• Writing Roman Numerals (1-1000)
• Reading Roman Numerals (1-1000)
• Roman Numeral Arithmetic