Addition and Subtraction - Adding 2 three digit numbers (exchange) - Planning

In Year 4, students tackle the challenge of adding two three-digit numbers with the need to exchange, a crucial step in developing their mathematical fluency. The lesson is structured with a small step starter, class teaching input, independent learning, and a plenary session. Essential resources for the lesson include a place value mat, coins, worksheets, and a presentation. The key vocabulary focuses on foundational concepts like place value, digit, exchange, and addition. Students begin by completing 'fluent in four' questions to refresh their memory of previous lessons. The class teaching input emphasises the importance of understanding when and why an exchange is necessary, using visual aids such as Base 10 or place value counters to model the process. Students are encouraged to use the written method alongside concrete examples to solidify their comprehension.

The lesson progresses with examples that illustrate exchanging tens for hundreds and using coins as a tangible representation of place value. A number story involving money saved by a character named Joe helps children understand the practical application of these concepts. They learn to exchange ten ones for one ten and to record this as column addition. As the lesson advances, students are presented with scenarios requiring no exchange, one exchange, and two exchanges, reinforcing their ability to identify when an exchange is needed. Independent work is supported by differentiated worksheets, and children are prompted to reason verbally using structured sentences. The lesson concludes with a 'Give me five' reflection, where students consider what they've learned, the skills they've used, and the importance of correctly showing exchanged digits in the column method. The lesson plan caters to different levels of understanding, from working towards the expected level to achieving greater depth with more complex word problems.