Targeted Year 4 resources for Roman numerals up to 100 (L and C), extending the number system to include L=50 and C=100, a core KS2 Maths objective. Activities build conceptual understanding of the new symbols and the subtractive rule (e.g., XL=40), promoting reasoning. This essential small step supports mastery of Roman numerals and is vital for meeting national curriculum expectations. The CS Maths Scheme provides structured conversion and reading tasks.