Addition and subtraction within 20 - Add by making 10 2 - Worksheet

The worksheet titled "Addition and Subtraction – Add by Making 10" is a practical exercise designed for children to enhance their addition skills within the number range of 20. The focus of the activity is to teach children the efficient strategy of making ten to simplify addition problems. It reinforces the concept of commutativity, showing that the order of numbers does not affect the sum. To support their learning, children are encouraged to use tens frames, which visually represent number bonds to 10 and guide them towards developing mental addition methods. Clues on a number line are provided to help children identify their starting point for each problem.

During the exercise, children are tasked with demonstrating how they reach the number 10 on their number lines by indicating the number of jumps, such as "+2". This method not only solidifies their understanding of addition but also introduces them to the concept of number sentences, which they must write to describe the actions performed on the tens frames. The worksheet also challenges children to show their grasp of commutativity by writing two different calculations that yield the same result using the provided tens frames. Answers are given as examples, showing the addition of two numbers and their sum, such as "4 + 11 = 15" or "7 + 10 = 17", and children are expected to replicate this process in their own work.