Phoebe's pays 4.2 pence per minute to use her phone. On average Phoebe uses her phone for 67 minutes per day. She pays her phone bill for 21 days.
Work out an estimate for how much Phoebe pays.
247 exam-style questions on AQA GCSE Maths Estimating. Each one has a worked solution and a mark scheme showing where the marks go.