Addition and subtraction within 20 - Add by counting on 2 - Worksheet

The worksheet provided is a practical tool for teaching children the concept of addition by counting on within the number range of 20. It aligns with the National Curriculum objective of adding and subtracting one-digit and two-digit numbers up to 20, including zero. The resources needed for the lesson are differentiated sheets and teaching slides, which cater to varying levels of student proficiency. The vocabulary for this lesson includes terms such as 'addition', 'commutativity', and 'represent', which are crucial for understanding the mathematical process involved.

Children are encouraged to explore the concept of addition by counting on from a larger number, which is a more efficient strategy. They learn that addition is commutative, meaning that the order of numbers does not affect the sum. The lesson emphasizes the importance of not including the starting number when counting on. To aid in visualizing the process, ten frames are used as a tool to represent numbers and the act of counting on. The worksheet also prompts reasoning and problem-solving by asking key questions about the relationship between the numbers and their representation, and how to correct any mistakes in the use of ten frames. The goal is for children to not only perform addition but to understand the underlying concepts and apply them with fluency and precision.