Eddie and Ellen use a calculator to work out 43.513.0+4.02\displaystyle \frac{43.5}{13.0 + 4.0^2}13.0+4.0243.5
Eddie's answer is 1.5
Ellen's answer is 15
One of those answers is correct.
Use approximations to find out which answer is correct.
247 exam-style questions on AQA GCSE Maths Estimating. Each one has a worked solution and a mark scheme showing where the marks go.