Practice~20 min
Exam-format practice
Ten Section A questions: calculate a ratio and explain how it moved.
Practice
Ten Section A questions. Before calculating, write down the definition the question gives: what is on top, what is underneath, how many decimal places.
Exam. In "most likely explanation" questions, test each option: does it affect the lines of this formula at all?
One try per question. The solution and marks come after each answer.