Addition and subtraction - Subtract a one-digit number from a three-digit number crossing 10 - Planning

In the Year 3 mathematics curriculum, the focus of Lesson 7 is on teaching pupils how to subtract a one-digit number from a three-digit number, specifically when this action requires crossing a ten. The lesson utilises a variety of resources including worksheets, presentations, and Base 10 equipment to facilitate learning. Key vocabulary such as 'subtraction', 'digit', 'hundreds', 'tens', 'ones', 'multiple', 'exchange', and 'method' are introduced to ensure clarity of the concepts being taught. The lesson begins with a recap of previous learning, ensuring that children are comfortable with the concept of regrouping numbers into different combinations of hundreds, tens, and ones. This foundational knowledge is critical as it allows for the understanding that numbers can be broken down and reassembled to facilitate subtraction.

During the class, children engage in practical activities that reinforce the concept of exchanging tens for ones when they do not have enough ones to subtract. A game involving dice and a 'banker' helps to illustrate this in a fun and interactive way. The lesson further explores different methods for subtraction, such as using place value counters to visualise the process and employing a number line to partition numbers and subtract by jumping back to the nearest multiple of ten. These activities are designed to enhance fluency and understanding of the subtraction process. Pupils are encouraged to reflect on their learning through key questions and a 'Give me five' plenary session, where they identify what they've learned, the skills they've used, and what they found challenging. Differentiated learning paths are available for children working towards the expected level, at the expected level, and at greater depth, with each path offering appropriate support and challenges to aid their understanding of subtraction across tens.