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

The worksheet provided is an educational resource designed to help Year 6 students master the skill of subtracting three-digit numbers from three-digit numbers, with a specific focus on exchanges. It aligns with the National Curriculum objective of using formal written methods for columnar addition and subtraction. To facilitate learning, differentiated sheets, teaching slides, and place value counters are utilised as resources. The vocabulary section includes terms such as 'add', 'subtract', 'methods', 'counting on', 'number line', 'near subtraction', 'number bonds', 'formal column subtraction', 'strategy', and 'exchange', which are crucial for understanding the concepts being taught.

Students are encouraged to explore column subtraction through hands-on activities with place value counters, ensuring they grasp the connection between the concrete manipulatives and the abstract written method. Progression is made from exchanging in one column to two columns, with emphasis on clear recording of exchanges in the written method. Key questions are posed to prompt critical thinking, such as choosing the appropriate method for a calculation, handling specific subtraction challenges, teaching others the process, and understanding the purpose and timing of exchanges. The worksheet also includes hints and tasks that require matching calculations to pictorial and column method representations, as well as reasoning and problem-solving exercises where students work out missing numbers and create their own subtraction problems involving exchanges.