Addition and Subtraction - Subtract a three digit number from a three digit number (no exchange) - Starter

In this Year 4 mathematics lesson, taking place in Autumn Term's Week 6, Day 2, students are tasked with mastering subtraction and addition involving three-digit numbers. The lesson begins with a 'Fluent in Four' revision exercise, where learners practice their mental arithmetic skills by solving problems such as subtracting 'three tens and 7' from 'fourteen and 5 tens', resulting in the answer 27. They are also challenged with straightforward subtraction calculations like '72 minus 57', which equals 15.

Further exercises require students to apply their understanding of place value in addition problems. For example, they must calculate '643 plus 8 tens', with the answer being 723, using a place value chart labelled with hundreds (H), tens (T), and ones (O) to aid their computation. Additionally, the lesson includes a practical element where children calculate missing measurements in a diagram, given that 'a' equals 10 cm. They must figure out the lengths of 'b', 'c', and 'd' based on their relationship to 'a'. To complete the lesson, students tackle larger addition problems, such as '5,235 plus 1,928' and '18,403 plus 13,918', with the respective answers being 7,163 and 32,321, consolidating their arithmetic skills in a variety of contexts.