Auntie's age 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Further Resources This task is about using algebraic expressions to find out people's ages. Ana is 13 and Lachlan is 11 years old. They were trying to guess their aunt's age. Question 1Change answer Their aunt said, Their aunt said, a) Their aunt must be more than how many years old? Question 1Change answer Their aunt then said, Their aunt then said, b) Their aunt must be less than how many years old? Question c) Which expression will give you Lachlan's age if Ana's age is x ? x + 2 x – 2 2x x/2 Question 1Change answer Finally their aunt said, Finally their aunt said, d) i) In how many years will this be? ii) What must their aunt's age be now? Task administration: This task is completed with pencil and paper or online (WITH automarking). Copyright: Person images: iStock Speech bubbles: NZCER Level: 5 Curriculum info: Maths, Number and Algebra, Equations and expressions Keywords: linear equations, algebraic expressions Description of task: Students solve algebraic problems about people's ages using information given. Learning Progression FrameworksThis resource can provide evidence of learning associated with Using symbols and expressions to think mathematically, sets 6-7 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y10 (09/1998) a) 37 very easy b) 46 very easy c) B (x – 2) easy d) i) ii) 20 44 [x + (x - 2) = 64, leading to x = 33. Ana will be 33, Lachlan will be 31, so this must be in 20 years' time.] moderate moderate Algebra arrays Delivering papers Algebra addition squares Garden perimeter and area Organising the school dance Length, area and algebra Working out perimeters
