Question Working Answer Mark AO Notes Grade 1 a Example n B1 2 B1 for explanation; an example could be given to B 2n means 2 × which is different from support the argument n 2 × 3 = 6 + 2. 2 + 3 = 5 B1 An additional mark can be given for identifying the n exception, which is when = 2 b M1 M1 for multiplying out the brackets to show that the two 3(c + 5) = 3c + 15 expressions are not equivalent c Example B1 B1 for explanation; an example could be given to n2 n× n means which is different from 32 = 3 × 3 = 9 support the argument 2 × 3 = 6 2n. B1 An additional mark can be given for identifying the n exception which is when = 2 d B1 Example B1 for an explanation; an example could be given to BIDMAS for 2n2 tells you to calculate support the argument 2n2 = 2 × (32) = the power first. BIDMAS for (2n)2 tells 2 × 9 = 18 you that you do the calculation inside (2 × 3)2 = 6 × 6 = 36 the bracket first. 6 2 f, B1 2 B1 for a clear explanation B A letter, say stands for an unknown if it is in an equation such as 3f + 2 = 14. f B1 B1 for an example alongside the explanation Then = 4 is the only number that satisfies this equation. B1 B1 for a clear explanation A letter stands for a variable if it is part B1 B1 for an example alongside the explanation of an equation that has more than two A A πr2 letters, e.g. = , where both r and are variables that will be different 4 A r. for different values of or
Question Working Answer Mark AO Notes Grade 1 a b c d Example 2 × 3 = 6 2 + 3 = 5 3(c + 5) = 3c + 15 Example 32 = 3 × 3 = 9 2 × 3 = 6 Example 2n2 = 2 × (32) = 2 × 9 = 18 (2 × 3)2 = 6 × 6 = 36 2n means 2 × n which is different from n + 2. n2 means n× n which is different from 2n. BIDMAS for 2n2 tells you to calculate the power first. BIDMAS for (2n)2 tells you that you do the calculation inside the bracket first. B1 B1 M1 B1 B1 B1 2 B1 for explanation; an example could be given to support the argument An additional mark can be given for identifying the exception, which is when n = 2 M1 for multiplying out the brackets to show that the two expressions are not equivalent B1 for explanation; an example could be given to support the argument An additional mark can be given for identifying the exception which is when n = 2 B1 for an explanation; an example could be given to support the argument B 6 2 A letter, say f, stands for an unknown if it is in an equation such as 3f + 2 = 14. Then f = 4 is the only number that satisfies this equation. A letter stands for a variable if it is part of an equation that has more than two letters, e.g. A = πr2 , where both A and r are variables that will be different for different values of A or r. B1 B1 B1 B1 2 B1 for a clear explanation B1 for an example alongside the explanation B1 for a clear explanation B1 for an example alongside the explanation B 4
Higher_Skills_Algebra_MarkScheme_AQA.docx