Addition and Subtraction - Adding 2 three digit numbers (no exchange) - Presentation

The lesson on adding two three-digit numbers without crossing tens or hundreds delves into the importance of place value alignment. Students are encouraged to consider why it is crucial to line up the hundreds, tens, and ones columns correctly when performing column addition. This foundational skill is reinforced through a series of activities where learners complete calculations by adding numbers in the correct place value columns. The exercises are designed to help students visualise the addition process and understand the structure of numbers, which is essential for accurate computation. They are also prompted to represent their calculations pictorially, further embedding the concept of place value.

Subsequent activities involve more complex calculations and reasoning tasks. For example, students are asked to identify errors in given calculations, such as missing placeholders in the tens column, and to correct them. This helps to consolidate their understanding of place value and the column addition method. Additionally, learners engage in problem-solving exercises where they must use digit cards to create the largest and smallest possible numbers and then add these together, demonstrating their ability to apply their knowledge in practical scenarios. Independent work tasks further challenge students to spot mistakes, use digit cards effectively, and represent numbers using equipment, deepening their comprehension of adding three-digit numbers without crossing key numerical boundaries.