Omar and Olive use a calculator to work out 789.36.22+3.9\displaystyle \frac{789.3}{6.2^2 + 3.9}6.22+3.9789.3
Omar's answer is 2
Olive's answer is 20
One of those answers is correct.
Use approximations to find out which answer is correct.
64 exam-style questions on Edexcel GCSE Maths Estimating. Each one has a worked solution and a mark scheme showing where the marks go.