Higher November 2024 Paper 5 Q8
8 Here is a question and an incorrect answer.
Explain why the answer is not correct. [2]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| Reason includes \(a4\) should be written as \(4a\) oe or the 4 is written after the \(a\) oe and \(6 \times b\) should be written as \(6b\) oe or the 6 and \(b\) should not be separated oe | 2 | B1 for correct explanation for one term \(a4\) should be written as \(4a\) oe or the 4 is written after the \(a\) oe or \(6 \times b\) should be written as \(6b\) oe or the 6 and b should not be separated oe or correct expression written \(4a + 6b\) | Must refer to error in each term for 2 marks Incorrect statements apply penalty 1 mark if 2 marks earned See appendix 2 |
Appendix 2: Question 8
Answers that imply the brackets have been multiplied incorrectly treat as incorrect statements
Do not accept for 2 marks 4a + 6b alone without some explanation but allow for B1
| Response | Mark | |
|---|---|---|
| A | He didn’t put the 6 and the b together to show it is multiplied. He put the 4 after the a when it should be before (oe) | 2 |
| B | Because they separated the b from the 6 and put the a in front of the 4 | 2 |
| C | In algebra the 4 should come before the a so it is 4a, the multiplication sign is not needed so it should be 6b 4a + 6b should not be simplified so the answer is 2a + 3b (penalty 1 after correct explanation for 2 marks then incorrect statement) | 1 |
| D | It is correct 4a + 6b | B1 |
| E | It is not written correctly, it should be 4a + 6b (B1 for 4a + 6b) | B1 |
| F | The answer is 4a + 6b | B1 |
| G | Because numbers have to be placed in front of letters (BOD for term in a, term in b not explained) | B1 |
| H | Shows 4a + 6b in working and then ‘because they can further simplify the answer by 2(2a + 3b)’ | B1 |
| I | It should be 4a + 6b, the student has not timesed the 6 and the b together | B1 |
| J | It is 6b not 6 x b – it has not been fully simplified | B1 |
| K | a4 is incorrect as 4 is the coefficient – it should be 4a | B1 |
| L | The answer should be 4a + 6b, he did the 2b calculation wrong he should have multiplied them together by 3 to get the answer | B1 |
| M | The number must be before the letter 4a + 6b | B1 |
| N | 4a + 6b written above answer lines and answer line blank | B1 |
| O | She has put 4 after the a and has only multiplied the number 2 by 3 without the b (one correct statement about a) | B1 |
| P | He has put 4a as a power and 6 x b should be 6b, should be 4a + 6b (B1 for 4a + 6b) | B1 |
| Q | They should not be separating the 6 and the b it should be 6b | B1 |
| R | The contents of the bracket were not expanded correctly it should be 2 x 3b = 6b (not explained error how term is written) | 0 |
| S | He has written a4 and 6 × b (further explanation about the error needed) | 0 |