The temperature in a laboratory freezer was −18∘C-18^{\circ}\text{C}−18∘C in the morning. By the afternoon, the temperature had risen to 5∘C5^{\circ}\text{C}5∘C.
Work out the difference between these two temperatures.
144 exam-style questions on Edexcel GCSE Maths Negative Numbers. Each one has a worked solution and a mark scheme showing where the marks go.