L12 Understand how the Numeral System has Changed

This Year 4 maths lesson plan explores how the numeral system has evolved from Roman numerals to the modern system with zero and place value, building on prior learning of place value and fractions. The lesson begins with a starter activity that recaps Roman numerals. Pupils practise writing missing numerals on number tracks to 10 and in tens, recalling the value of each symbol and consolidating previous learning. During the introduction, children investigate how the numeral system changed over time. Using interactive slides, they discuss the significance of zero and place value and how these innovations simplified calculations. Pupils revisit key Roman numeral rules, exploring how each symbol represents a fixed value regardless of its position, unlike our modern place value system. They practise matching Roman numerals with their corresponding numbers and explore how addition and subtraction rules are applied within the system. The main activity encourages collaborative, hands-on learning. Pupils work in small groups with cut-up Roman numeral resource sheets. They select a Roman numeral, determine its value, and record the corresponding number in their maths books. The slides provide visual support to ensure accuracy. This activity develops reasoning, pattern recognition, and confidence in handling Roman numerals. In the plenary, children analyse a scenario in a speech bubble from Esin, discuss whether they agree, and explain their reasoning. The correct calculation is revealed on the slides, helping address common misconceptions such as adding symbols regardless of order, confusing similar symbols, repeating symbols too many times, or misinterpreting symbols as place value digits. Key questions throughout the lesson, such as “Why is 4 written as IV and not IIII?” and “How has the numeral system changed?”, encourage pupils to explain their thinking, recognise patterns, and deepen their understanding. This structured, interactive lesson supports Year 4 pupils in app