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.
Practise OCR GCSE Maths Estimating with exam-style questions for Foundation and Higher tier. 64 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.