Addition and Subtraction - Subtract a three digit number from a three digit number (exchange) - Worksheet

The educational resource focuses on enhancing the mathematical fluency and precision of students, specifically in the subtraction of three-digit numbers, with particular emphasis on instances where exchanging is necessary. The National Curriculum objective is to enable students to add and subtract numbers up to three digits using formal written methods, including columnar addition and subtraction. To facilitate this learning, the worksheet provides differentiated sheets, teaching slides, and place value counters as resources. The key vocabulary for the lesson includes terms such as 'add', 'subtract', 'methods', 'counting on', 'number line', 'near subtraction', 'number bonds', 'formal column subtraction', 'strategy', and 'exchange'.

Students begin by exploring column subtraction with the aid of concrete manipulatives, ensuring they understand the connection between the concrete and abstract methods. They progress from performing an exchange in one column to exchanges in two columns, with an emphasis on the clear recording of any exchanges in the written method. The worksheet presents various exercises, including calculations using place value counters and matching calculations to pictorial and column method representations. Additionally, the resource challenges students with reasoning and problem-solving activities, where they must identify and correct errors in subtraction problems involving exchanges, further cementing their understanding of the concept.