Addition and subtraction within 20 - Compare number sentences - Planning

In Year 1, students are introduced to the concept of comparing number sentences within the range of 20, a key skill in their mathematical development. The lesson plan encompasses a variety of resources such as differentiated worksheets, teaching slides, ten frames, counters, bar models, and part-whole models to aid in the learning process. The key vocabulary for this lesson includes terms like 'compare', 'greater than', 'less than', and 'equal to', all fundamental in understanding how to evaluate numerical expressions. The children are encouraged to engage in partner work to foster discussion and articulate their reasoning using full sentences. They begin by comparing numbers visually using ten frames, learning to recognize equivalences and differences without the need for explicit calculation.

As the lesson progresses, the students are taught to be efficient in their comparisons by first determining if a calculation is necessary before choosing the correct symbol to complete a statement. Through examples presented, they learn to identify patterns such as commutative properties in addition and the effects of subtraction from the same initial number. The lesson also incorporates reasoning and problem-solving activities, where students are prompted to explain their thought process and identify errors in given statements. By the end of the lesson, students are expected to have developed skills in comparison and have a better understanding of the relationship between different arithmetic operations. The lesson plan is structured to cater to different levels of understanding, from working towards expected levels to achieving greater depth, with activities ranging from visual comparisons to abstract reasoning with word problems.