Foundation November 2024 Paper 1 Q4
4
(a) Write down all the factors of 20 [2 marks]
(b) Mica says,
“When two multiples of 5 are added, the answer is always a multiple of 10”
Give one example to show that he is wrong. [1 mark]
| Answer | Mark | Comments |
|---|---|---|
| 1, 2, 4, 5, 10, 20 | B2 | any order B1 5 or 6 correct values with up to 2 incorrect values or 4 correct values with 0 or 1 incorrect values or 3 correct values with 0 incorrect values |
Additional guidance
| Allow values given in pairs eg \(1 \times 20\), \(2 \times 10\), \(4 \times 5\) 6 factors eg (2, 10), (4, 5) | B2 B1 |
| Repeated values score max B1 eg 1, 2, 4, 5, 10, 10, 20 eg 1, 2, 2, 5 | B1 B1 |
| If a prime factor tree or similar is used then the factors must be identified |
| Answer | Mark | Comments |
|---|---|---|
| One correctly evaluated counterexample | B1 | eg \(5 + 10 = 15\) or \(1 \times 5 + 4 \times 5 = 25\) condone 0 as a multiple of 5 |
Additional guidance
| One correctly evaluated counterexample seen amongst other trials | B1 |