Foundation November 2024 Paper 2 Q20
20 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 3 |
Appendix
APPENDIX 3 Question 20
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 \(6 \times b\) – 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 \(6 \times b\) 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 \(2 \times 3b = 6b\) (not explained error how term is written) | 0 |
| S | He has written \(a\)4 and \(6 \times b\) (further explanation about the error needed) | 0 |