Length and height - Subtracting lengths - Planning

In the second week of Spring term, Year 1 pupils explore the concept of subtracting lengths in a structured lesson that combines practical activities with class discussions and independent learning. The lesson is supported by a variety of resources, including differentiated worksheets, teaching slides, and hands-on measuring tools like cubes, rulers, and mini whiteboards. Key vocabulary terms such as 'length', 'height', 'measure', 'subtract', and 'difference' are introduced, with vocabulary cards available for reinforcement. The lesson begins with a starter activity where children discuss what it means to subtract one length from another, using a chocolate bar example to illustrate subtraction in a tangible context.

During the practical work segment, students spend time measuring and subtracting the lengths of classroom objects, primarily using cubes for measurement, although more advanced pupils may use centimetres. This hands-on approach helps them grasp the concept of finding the difference between lengths. Following this, the class regroups to discuss Activity 2, which involves measuring snail trails on a ruler and using it as a number line to find the difference in lengths. The lesson culminates with differentiated worksheets for fluency and reasoning, where students independently apply their learning. Throughout the lesson, key questions prompt students to think critically about the properties of length and height and the process of subtraction. Common misconceptions are addressed, such as incorrect starting points when measuring and confusion over the language of 'difference'. The lesson also includes a reflective 'Give me five' activity, encouraging students to consider what they've learned and the skills they've used or found challenging, ensuring they remember key takeaways from the day's lesson.