Addition and subtraction - Three-digit and one-digit numbers not crossing 10 - Planning

In Year 3, during the Autumn Addition and Subtraction Week, a lesson is designed to strengthen students' skills in adding and subtracting three-digit and one-digit numbers without crossing the ten boundary. The lesson utilises place value counters, worksheets, and a presentation to aid teaching. Key vocabulary such as 'addition', 'subtract', 'digit', 'hundreds', 'tens', 'ones', 'exchange', and 'method' are introduced. The lesson begins with a recap of previous learning, followed by practical activities where children use place value counters to represent numbers and perform calculations. For example, students are asked to represent the house points for the Red and Yellow houses, both starting with 414 points, and then either add or subtract three points, observing the changes in the ones column and the overall value of the number.

Following practical exercises, children engage in partner work and reasoning activities to deepen their understanding. They explore different ways to represent calculations, such as words, number lines, bar models, and part-whole models, and use stem sentences to articulate their mathematical reasoning. The lesson encourages students to question which column they need to focus on and to identify patterns in addition and subtraction. To conclude, students reflect on what they have learned, the skills they used, and any challenges they faced. The lesson is differentiated to cater for varying levels of ability, from working towards fluency in building number sentences with base ten equipment to achieving greater depth by solving complex problems involving addition and subtraction without the need for exchanging.