Negative number cards 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about multiplying negative numbers. Six students are each given a card with a number on it as shown above. The students get into pairs, and each pair multiply their numbers together to get a score. Question 2Change answer a) What score would the following pairs get when they multiply their numbers together? a) What score would the following pairs get when they multiply their numbers together? i) Chris and Sue ii) Anne and Paulette iii) Marie and Chris iv) Paulette and Marie Question 2Change answer b) Which pair (of all possible pairs) of students could multiply their numbers together to make: b) Which pair (of all possible pairs) of students could multiply their numbers together to make: i) the biggest score? and ii) the most negative score? and Task administration: This task can be administered with pencil and paper or online. Level: 5 Curriculum info: Maths, Number and Algebra, Number Strategies Keywords: negative numbers, multiplication Description of task: Students solve multiplication problems involving negative numbers, finding the biggest and the smallest products. Answers/responses: Y10 (11/2001) a) i) ii) iii) iv) 8 ⁻21 ⁻20 15 4 correct - very easy 3 correct - very easy b) i) ii) Marie and Brian [accept ⁻5 and ⁻6] Anne and Brian [accept 7 and ⁻6] moderate moderate Diagnostic and formative information: Common error Likely reason b) i) Anne + Chris Fails to see that ⁻5 × ⁻6 is greater than 7 × 4, probably because they see the former as negative. Next steps: Extension: The students then get into groups of three and again multiply their numbers together to get a score. Which group of three could make the smallest score? _______________ and _______________ and _______________ Showing temperature changes Changing temperatures TV game show Red and black Indoor cricket scores Positive and negative number line Ordering temperatures Water level Working with negative numbers