Addition and subtraction within 20 - Subtraction crossing 10 2 - Presentation

In a comprehensive set of teaching slides on subtraction, specifically focusing on the concept of subtraction crossing the tens boundary, students in Year 6 are encouraged to deepen their understanding through a variety of engaging activities. The lesson utilises part-whole models to aid in finding the missing parts of subtraction equations. Students are asked to consider what each part of the model represents and how it can be applied in solving subtraction problems. The slides prompt discussions about the methods used in subtraction and the significance of each component within the part-whole model. These discussions are aimed at reinforcing the students' comprehension of the subtraction process when the calculation involves crossing over from one ten to the next.

Interactive activities within the lesson include completing number sentences that describe scenarios involving sweets, biscuits, cars, and other objects to bring a real-world context to the mathematical concepts. For example, students are asked to determine how many sweets remain after a certain number have been eaten, and how many cars are red if a given number are blue. These activities not only help students practice their subtraction skills but also encourage them to use visual aids such as counters and bar models to represent and solve the problems. Furthermore, the slides offer reasoning tasks where students must justify their chosen methods and explain their thinking, thereby enhancing their critical thinking and problem-solving abilities. The lesson concludes with independent work where students apply what they've learned to new problems, demonstrating their mastery of subtraction across the tens boundary.