Addition and subtraction within 20 - Subtraction crossing 10 - Planning

The curriculum for Year 1 Spring includes a focus on addition and subtraction within 20, particularly honing skills in subtraction crossing 10. National Curriculum objectives set the stage for representing and using number bonds, interpreting mathematical statements, and solving one-step problems with various aids such as concrete objects and pictorial representations. The key vocabulary for this unit includes terms such as 'addition', 'commutativity', 'number bonds', 'subtract', and phrases like 'How many left?' to ensure a thorough understanding of the concepts. During the week, children will engage in activities that involve partitioning numbers to cross the ten barrier, using resources such as differentiated worksheets, teaching slides, ten frames with counters, and number lines. The aim is to solidify their grasp of subtraction by partitioning and to encourage the use of full sentences in partner discussions to explain their reasoning.

In the subsequent lesson, children delve deeper into the concept of subtraction crossing 10 by using partitioning alongside number lines. They start by examining different subtraction statements, identifying similarities and differences, and utilising partitioning to facilitate subtraction. This approach helps them understand the importance of comparing numbers and reinforces the concept of equality in mathematical statements. The lesson includes reasoning and problem-solving activities that prompt students to explore various methods of subtraction and to articulate their thought processes. Children are encouraged to use the vocabulary cards and definitions available on the website to enhance their understanding. To conclude the lesson, there's a reflection segment where children are asked to consider what they've learned, the skills they've used and found challenging, the resources that have aided them, and the key takeaways they promise to remember. Differentiated outcomes are expected, with some children working towards fluency in the concept, while others are expected to grasp the partitioning and use of number lines, and those at greater depth will tackle incomplete questions using given clues.