Subtracting 4-Digit Numbers with Exchanges Revision - PowerPoint

This educational resource is centered around a Maths lesson on subtracting 4-digit numbers with exchanges, tailored for Year 5 students. The lesson begins by revisiting essential subtraction vocabulary such as 'minus', 'subtract', 'take away', 'least', 'less than', and 'count back'. It emphasizes the importance of number order in subtraction, unlike addition, where numbers can be commutative. The lesson guides students through the process of setting out a subtraction calculation correctly, with the larger number on top and the smaller number beneath, using the column method.

Students learn the crucial step of exchanging when a digit in the lower row exceeds the corresponding digit in the upper row of a subtraction problem. For instance, when subtracting 2,854 from 3,528, if the digit in the tens column of the bottom number is larger than that of the top, an exchange is necessary. The method involves borrowing from the adjacent left-hand column, adjusting the numbers accordingly, and then proceeding with the subtraction. The lesson includes practical examples, using place value counters to visualize the process, and provides various exercises to practice and reinforce the concept. Students are encouraged to apply this knowledge to solve problems, complete bar models, and correct mistakes in sample calculations to deepen their understanding of the topic.