Decimals - Complements to 1 - Planning

In the Year 5 summer curriculum focusing on decimals, the first week introduces students to the concept of complements to 1. This foundational step in understanding decimals is supported by a variety of resources including worksheets, presentations, number lines, part-whole models, hundred squares, and counters. The lesson begins with a recap of adding whole numbers and making links to number bonds to 10 and 100, reinforcing the concept that, for example, 0.3 represents 3 tenths. Students then engage in activities that utilise a hundred square to visually comprehend how to find the complement to 1, learning to work efficiently by understanding the value of each row.

Further practical activities involve using part-whole models and counters to explore complements to 1 with tenths, hundredths, and thousandths, encouraging multiple methods and the articulation of mathematical reasoning with sentence stems. The lesson also incorporates partner work, where students use number lines and place value grids to deepen their understanding of decimal place value and complements to 1. Differentiated worksheets provide independent learning opportunities tailored to varying levels of proficiency, from working towards the expected standard to achieving greater depth. The lesson concludes with a reflective 'Give me five' activity, prompting students to consider what they have learnt, the skills they utilised, any challenges faced, the resources that aided their learning, and the key takeaways to remember from the lesson.