Place value - 1, 10, 100 more or less - Planning

In the second week of Autumn term, Year 3 students embark on a mathematical journey to deepen their understanding of place value, specifically focusing on the concept of finding 1, 10, or 100 more or less than a given number. This lesson is a continuation of their Year 2 curriculum, where they initially learned to find one more or less. The class is encouraged to use Base 10 or place value counters to represent three-digit numbers and explore the changes that occur when 10 or 100 are added or subtracted. Key vocabulary such as 'number', 'hundreds', 'tens', 'ones', 'more', and 'less' is reinforced. The children are prompted to observe and discuss what stays the same and what changes, especially when crossing the hundred boundary. The lesson includes practical activities, independent work, and plenary discussions to consolidate learning.

During the lesson, children are presented with various activities that challenge them to find 10 or 100 more or less than a given number and to represent their answers in different forms, such as numerals, words, or with manipulatives. They engage in partner talk to discuss true or false statements about the effects of adding or subtracting 100, using manipulatives to prove their reasoning. The lesson also includes reasoning challenges to deepen their understanding of three-digit numbers and the importance of zero as a placeholder. To assess their learning, students reflect on the skills they've used, such as adding, subtracting, and counting in multiples of 10 or 100, and they make a 'pinkie promise' to remember key aspects of the lesson. Differentiated activities are provided to cater to varying levels of proficiency, from working towards expectations to achieving greater depth in their understanding of place value.