Addition and Subtraction - Subtract two 4-digit numbers ( more than one exchange - Presentation

In this mathematics lesson, pupils will delve into the process of subtracting two 4-digit numbers, with a particular focus on scenarios requiring more than one exchange. The lesson challenges students to consider subtraction problems that involve multiple exchanges and to articulate their understanding through a subtraction number sentence. The class is encouraged to discuss and explore the concept before moving into hands-on activities. The use of place value counters is introduced as a practical tool to aid in the visualisation and completion of the subtraction problems. Students are reminded of the importance of exchanging between columns when direct subtraction is not possible, reinforcing the concept of borrowing from one place value to another.

Further activities require students to find missing numbers in subtraction equations, prompting them to think critically about the steps needed to solve the problems and the operations required. Through guided instruction and questioning, students are led to understand the necessity of using subtraction to find missing addends. The lesson also includes a reasoning component where students evaluate the solutions provided by fictional characters, Tia and Rosie, discussing the correct answer and the logic behind it. This fosters a deeper understanding of the subtraction process and the common pitfalls that can occur. Independent work consolidates learning, with exercises that ask students to write calculations and identify missing numbers, while discussions focus on strategies for when digits being subtracted are smaller and the process of exchanging. The lesson concludes with the suggestion of using the inverse operation to check calculations, further embedding the mathematical concept of subtraction with multiple exchanges.