Addition and Subtraction - Subtracting whole numbers with more than 4-digits - Presentation

The lesson plan focuses on the subtraction of whole numbers exceeding four digits, a mathematical concept that is vital for Year 6 students. The objective is for pupils to become adept at handling complex subtraction problems that require multiple exchanges. They start by discussing with a partner how to identify when an exchange is necessary within a subtraction calculation. The lesson includes a series of well-structured activities that prompt the students to perform subtractions with different scenarios, such as determining the remaining flight altitude of a plane after descent, calculating the new balance after purchases from a business account, and comparing annual earnings between individuals.

Through these exercises, students are encouraged to use column subtraction to solve word problems and to understand the importance of starting with the ones column to avoid errors. They are also challenged to consider the impact of exchanging and to recognise which columns will be affected. The lesson addresses common questions such as the significance of the order of numbers and whether it matters if the numbers have different amounts of digits. To deepen their understanding, students engage in reasoning tasks where they correct mistakes, compare calculations to determine true or false statements, and use given digits to form accurate calculations. Independent work further reinforces their fluency in subtraction, ensuring they grasp the concept of subtracting more than four-digit numbers effectively.