Recall and use addition and subtraction facts to 20 2 - Reasoning

The ability to recall and use addition and subtraction facts to 20 is a fundamental skill in mathematics, particularly for young learners who are building their numerical fluency. This skill involves not only the memorisation of basic arithmetic facts but also the application of these facts to solve problems that require reasoning. Mastering this skill enables students to quickly and accurately perform simple calculations, which serves as a foundation for more complex mathematical concepts and operations.

In a lesson focused on reasoning, students are encouraged to go beyond rote memorisation and to understand the relationships between numbers. This might involve activities where they are asked to identify patterns, explain their methods, or find multiple ways to reach a solution. For example, when working with addition and subtraction facts up to 20, students might explore the commutative property of addition, or the concept that numbers can be added in any order (e.g., 8 + 12 is the same as 12 + 8). They might also be challenged to apply their knowledge to real-life scenarios or word problems, which require them to decide whether to add or subtract, and to explain their reasoning clearly. This approach not only reinforces their arithmetic skills but also enhances their problem-solving abilities and mathematical reasoning.