Addition and subtraction - Subtract with two-digit numbers crossing 10 - Planning

In Year 2, Autumn Addition and Subtraction Week 4, the focus is on the concept of subtracting two-digit numbers while crossing the number 10. This step is crucial for students to master as it involves understanding the exchange process. The lesson is equipped with resources such as chalks, Base 10 blocks, place value grids, worksheets, and a presentation to facilitate learning. Key vocabulary includes terms like subtraction, exchange, tens, and ones, which are essential for the children to comprehend and use. The lesson begins with a recap of previous learning and a starter activity where children complete 'fluent in four' questions to warm up their mathematical thinking.

The class is then engaged in a series of practical activities, starting with using chalk to draw number lines on the playground, which helps them visualize the process of subtraction by jumping back in tens and ones. The next activity uses Base 10 blocks to partition numbers in various ways, reinforcing the concept of place value. This leads to the final activity, where students are introduced to the formal method of column subtraction through number stories and hands-on practice. Throughout the lesson, children are encouraged to use stem sentences and concrete resources to support their understanding. Differentiated worksheets and reasoning questions are provided for independent work, allowing children to apply their knowledge at varying levels of depth, from working towards the expected level to achieving greater depth in subtraction.