1.24 Estimating Calculations GCSE PowerPoint Lesson

This 22-slide lesson, covers how to estimate answers to calculations by rounding each number to one significant figure. Students will apply this technique to a range of operations, including addition, subtraction, multiplication, and division, and use it to check the reasonableness of answers. The lesson will also explore overestimates and underestimates, helping students to develop number sense, approximation skills, and confidence in tackling unfamiliar or multi-step problems.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Two structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential numeracy concepts.