Girl Guide biscuits 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about working out profit. Question 1Change answer a) Girl Guides selling biscuits made $2 profit for every 6 packets of biscuits they sold. How many packets of biscuits would they need to sell to make $500 profit? a) Girl Guides selling biscuits made $2 profit for every 6 packets of biscuits they sold. How many packets of biscuits would they need to sell to make $500 profit? packets Question 1Change answer b) If they made $2.50 profit for every 8 packets of biscuits they sold, how many packets would they now need to sell to make $500 profit? b) If they made $2.50 profit for every 8 packets of biscuits they sold, how many packets would they now need to sell to make $500 profit? packets Question 1Change answer c) If every 8 packets made them $2.50 profit, and on average they sold 2 packets per house they visited, how many houses would they need to visit to make the $500 profit? c) If every 8 packets made them $2.50 profit, and on average they sold 2 packets per house they visited, how many houses would they need to visit to make the $500 profit? houses Task administration: This task can be completed with pencil and paper or online (with auto marking displayed to students). Level: 5 Curriculum info: Maths, Number and Algebra, Number Strategies Keywords: money, rates Description of task: Students calculate the number of packets of biscuits that need to be sold, and how many house visits are needed to attain a given profit. Learning Progression FrameworksThis resource can provide evidence of learning associated with Multiplicative thinking, sets 8-9 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y9 (05/97) Y10 (05/97) a) 1 500 very difficult moderate b) 1 600 very difficult difficult c) 800 [Accept if c) = 1/2 b)] very difficult difficult Diagnostic and formative information: Student response Likely calculation Likely misconception a) 250 200 500 ÷ 2.00 500 ÷ 2.50 Uses profit per packet rather than profit per 6 (or 8) packets. a) b) 83.33 62.50 500 ÷ 6 500 ÷ 8 Divides by inappropriate amount. Chocolate special Tomato sauce Charging the car
