# Fun with mathematics

## This is the second of a four-part series. The questions are targeted at Primary 5 pupils, and the worked solutions and advice have been contributed by Assistant Professor Lee Ngan Hoe, Assistant Head (Mathematics Education - Teaching) of the Mathematics & Mathematics Education Academic Group from the National Institute of Education at Nanyang Technological University. Prof Lee is also the co-author of Shaping Maths And Maths Works.

• Try to understand the problem first. What is the problem about? What do you know about the four test scores if you know the average of these scores? What does it mean to say that "the lowest score was 17 marks lower than his highest score"? What is meant by "the lowest score was no less than 75"? What are you supposed to find?
• Work out a plan to solve the problem. Are there relationships among the pieces of information in the problem? This is a multiple choice question. Could you make use of these options to solve the problem?
• Try to make sense of the answer. Is there a way to check it? What have you learnt from solving this problem that might help you to solve multiple choice questions in future?