Foundation June 2018 Paper 2 Q10
10
(a) Write down all the prime numbers between 20 and 30 (2)
Catherine says,
“2 is the only even prime number.”
(b) Is Catherine right?
You must give a reason for your answer. (1)
You must give a reason for your answer. (1)
| Answer | Mark | Mark scheme |
|---|---|---|
| 23, 29 | B2 | for 23 and 29 and no extras |
| (B1 | for one correct and no more than one incorrect) |
Additional guidance
2 correct and 1 incorrect award B1
| Answer | Mark | Mark scheme |
|---|---|---|
| Explanation | C1 | for decision and explanation eg yes and because all other even numbers have 2 as a factor |
Additional guidance
Decision is required may be yes or implied by she is ... oe.
Do not accept statements that are ambiguous, or contradictory