--- title: "Roman numerals to 100" description: "Read Roman numerals to 100 (I to C) and understand that the numeral system changed over time to include zero and place value" canonical: https://lightmysky.com/learn/mathematics/roman-numerals-to-100-mt_MewIRdzpzz source: https://lightmysky.com/learn/mathematics/roman-numerals-to-100-mt_MewIRdzpzz.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Roman numerals to 100 Read Roman numerals to 100 (I to C) and understand that the numeral system changed over time to include zero and place value Subject: Mathematics · Area: Number Representation & Place Value · Ages 8 to 9 Page: https://lightmysky.com/learn/mathematics/roman-numerals-to-100-mt_MewIRdzpzz ## Ready when they can - Read and write Roman numerals I, V, X, L, C and combinations up to 100 - Convert between Roman numerals and Hindu-Arabic numerals (e.g. XLIV = 44) - Explain that Roman numerals have no zero and no place-value system ## Lesson: Roman numerals Long ago, the Romans wrote numbers using letters instead of digits. I means 1, V means 5, X means 10, L means 50, and C means 100. You build bigger numbers by combining these letters. *(drawing: Look at IV. A small letter before a bigger one means subtract instead of add.)* Two rules control every Roman numeral. If a smaller letter comes after a bigger one, add it: VI is 5 + 1, which is 6. If a smaller letter comes before a bigger one, subtract it: IV is 5 - 1, which is 4. **Example.** Look at XLII. Split it into parts. XL is a 10 before a 50, so subtract: 50 - 10 = 40. II is 1 + 1 = 2. Put the parts together: 40 + 2 = 42. **Tip.** Roman numerals never had a zero, and a letter always means the same amount no matter where it sits. X is always 10, first, middle, or last. That is very different from the place value you know, where a digit's position changes what it is worth. **Recap.** Roman numerals use letters like I, V, X, L, and C added or subtracted together, with no zero and no place value. ## Practice 17 questions on this page, each with its working shown. ## Needs first - [Place value of each digit](https://lightmysky.com/learn/mathematics/place-value-of-each-digit-mt_jY7uf0Cb7o) ## Opens up - [Roman numerals to 1000](https://lightmysky.com/learn/mathematics/roman-numerals-to-1000-mt_To9HdLy8vq)