Addition and subtraction within 20 - Subtraction crossing 10 2 - Planning

In a Year 1 mathematics lesson centred around subtraction within 20, particularly focusing on scenarios where subtraction crosses the number 10, a variety of resources are employed to enhance learning. These resources include differentiated worksheets, teaching slides, ten frames with counters, paper ten frames, and whiteboards. The lesson begins with a review of previous learning, where children are encouraged to articulate their understanding of subtraction using full sentences and a part-whole model. The main activity involves using ten frames to visually represent subtraction problems, helping children to understand the concept of 'how many left' after a certain number is subtracted. Practical activities further reinforce this understanding, using real-life examples such as counting sheep in a field or cars of different colours, to illustrate subtraction in a relatable context.

As the lesson progresses, students are challenged with reasoning and problem-solving activities that require them to apply their knowledge of subtraction to various scenarios, like determining the number of sweets of a particular flavour left after some are taken away. Key questions prompt the children to reflect on the methods and tools that aid their subtraction process, whether they are counting forwards or backwards, and to consider which strategies they prefer to use. The lesson concludes with a 'Give me five' reflection exercise, where children evaluate what they've learned, the skills they've applied, and any challenges they faced. Differentiated worksheets cater to varying levels of understanding, ranging from 'Working Towards' with visual aids and manipulatives, to 'Expected' where children work more independently, and up to 'Greater Depth' where they are tasked with solving more complex problems with the support of manipulatives.