Addition and subtraction - Subtract a three-digit number from a three-digit number exchange - Planning

In a Year 3 mathematics lesson, students are introduced to the concept of subtracting three-digit numbers from three-digit numbers with the need to exchange. This lesson, part of the Autumn Addition and Subtraction curriculum, involves a step-by-step approach to understanding and mastering column subtraction. The class begins with a starter activity, where children complete 'fluent in four' questions to recap previous learning, particularly focusing on the use of concrete manipulatives to demonstrate exchanges during subtraction. The teaching input then guides students through practical activities using place value mats and counters to visually and physically represent the subtraction process. Key vocabulary such as 'place value', 'digit', 'exchange', 'equals', 'subtraction', 'hundreds', 'tens', and 'ones' is emphasized, ensuring children grasp the language associated with the mathematical operations they are performing.

Following the initial demonstration, students engage in group and partner work to build fluency and reasoning. They are encouraged to explain their thought processes, using digital tools if available, to create visual representations of the subtraction method. This helps to deepen their understanding of the procedure and allows them to articulate their reasoning using structured sentences. The lesson also addresses common misconceptions, such as the role of zero as a placeholder and the non-commutative nature of subtraction. Students conclude the lesson with independent practice through differentiated worksheets, reflecting on the skills they have learned and used, as well as any challenges they encountered. The 'Give me five' plenary encourages self-assessment and ensures they remember the key points of the lesson, with different levels of support and challenge provided to cater to varying depths of understanding.