Buying some gear 0 Overview Using this Resource Connecting to the Curriculum Marking Student Responses Working with Students Further Resources This task is about adding up decimal money values. Question 1Change answer a) Josh had saved $329 in his bank account. He used his EFT POS card to buy: a refurbished laptop for $150.80, two flash drives for $18.50 each, and a headphones for $32.90. a) Josh had saved $329 in his bank account. He used his EFT POS card to buy: a refurbished laptop for $150.80, two flash drives for $18.50 each, and a headphones for $32.90. How much did he spend? $ Question 1Change answer b) Chelsea had $573. She bought: a new phone for $159.50, a spare phone charger for $12.70, a micro SD card for $15.20, and $30 phone top up. b) Chelsea had $573. She bought: a new phone for $159.50, a spare phone charger for $12.70, a micro SD card for $15.20, and $30 phone top up. How much did she spend? $ Task administration: This task can be completed with pencil and paper or online (with auto marking displayed to students) Level: 4 Curriculum info: Maths, Number and Algebra, Number Strategies Keywords: money, spending, addition Description of task: Students add up amounts of money including dollars and cents. Curriculum Links: This resource can be used to help to identify students' understanding of adding decimals (Number Strategies). Learning Progression FrameworksThis resource can provide evidence of learning associated with Additive thinking, sets 7-8 within the Mathematics Learning Progressions Frameworks.Read more about the Learning Progressions Frameworks. Answers/responses: Y8 (11/2013) a) $220.70 difficult b) $217.40 moderate Based on an online sample of 97 Y8 students in Oct-Dec 2013. Diagnostic and formative information: Common error Likely misconception Next Steps a) 202.20 b) 187.40 Misses out items to be added (close reading error) Misses one of the items costing $18.50) Misses the item costing $30 The student may need to re-read the problem carefully. They need to make sure that they have included all of the items in each problem. Close reading errors are common in mathematics, especially in number problems. a) 218.70.20 or 219.70 etc. b) 216.40, 207.40 or 208.40 etc. Place value error: recombining decimals or whole numbers Students may work with playmoney coins and notes. They should recombine ten lots of 10 cents into $1. If they also fail to recombine the ones and tens, use $1, $10 and $100 notes. Checking the bank account Buying fruit and vegetables Which bottle size? Estimate these Money computations Te Ahurei Kapa Haka Comparing prices
