These Year 9 percentage change and simple interest starters are 10 quick mental maths questions for pupils aged 13-14. Use them in the first five minutes of a lesson or as a daily warm-up at home.
Year 9 percentage change and simple interest starters: the 10 questions
How to use these Year 9 percentage change and simple interest starters
First, give yourself about 30 seconds for each question. Then write the answer down before you check it. If an answer is wrong, look at the percentage change and simple interest lesson again. After that, move on to the percentage change and simple interest worksheet for longer questions.
Finally, repeat these starters a few days later, because regular practice makes the facts automatic. Moreover, all the pages of this chapter work together, so you can move between them at any time. For example, many pupils read the lesson on Monday, practise on Wednesday and test themselves on Friday.


















