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Functional Question Foundation (Algebra 3) For the week beginning ….

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Cook for 15 minutes at 220 °C Reduce the oven temperature to 160 °C and cook for 40 minutes per kilogram. Here are instructions for cooking a turkey. Kirsty is going to cook a 7 kilogram turkey. She wants to take it out of the oven at 12:45 pm. At what time must she start to cook it? Answer............................................. (Total 4 marks)

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15 + 7 × 40 or 295 7 × 40 or 280 M1 – Method mark (their) 295 ÷ 60 or 4 h 55 m (their) 280 ÷ 60 or 4 h 40 m Or equivalent M1 – Method mark 12:45 – (their) 4 h 55 m 12:45 – (their) 4 h 40 m – 15 m M1 – Method mark 07:50 Or equivalent SC3 08:05 A1 - Accuracy marks are awarded when following on from a correct method [4]

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Common Mistakes – what did the examiners say? About 80% of candidates scored one mark or more with 35% scoring 3 or 4. Poor arithmetic marred attempts at this multi-step functional question with the conversion of minutes to hours and minutes and the subtraction of their time from 12:45 causing a problem for many. Candidates who knew what to do could score 3 marks despite arithmetic errors as long as they showed their method. A common error was to ignore the 15 minutes cooking at 20°C with 08:05 or the working leading to it being seen fairly often.

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