The temperature in Glasgow one day was −4∘C-4^{\circ}\text{C}−4∘C. The next day the temperature was 3∘C3^{\circ}\text{C}3∘C lower.
Verify that the new temperature was −7∘C-7^{\circ}\text{C}−7∘C.
370 exam-style questions on AQA GCSE Maths Negative Numbers. Each one has a worked solution and a mark scheme showing where the marks go.