Addition and subtraction - Subtract a one-digit number from a three-digit number crossing 10 - Starter

This exercise is designed for Year 3 students in their Autumn term, specifically for Week 5, Day 2, to practice and revise their subtraction skills. The task requires students to subtract a one-digit number from a three-digit number, ensuring they understand how to cross the number 10 when necessary. Students are instructed to show their working out in their books, and the method suggested is to count back from the larger number. For example, they are presented with calculations such as 56 – 29 and must find the answers by using this counting back technique. Additionally, they need to calculate half of a given number and then subtract, as seen in the problem "Half of 40 – 14."

The worksheet also includes problems that require direct calculation, like 63 – 5 and 95 – 7, and students are expected to write down the answers. To ensure accuracy, they are encouraged to use inverse calculations to check their work. For instance, if they have solved 14 + 3 = 17, they can check this by verifying that 17 – 3 = 14. There is a practical application of these subtraction skills as well, where students must find out how many cakes Tyler brings to school if he has 28 and takes half of them. This exercise not only reinforces arithmetic skills but also integrates understanding of halves and the concept of checking work using inverse operations.