Foundation November 2017 Paper 3 Q10
10 Megan says,
“If you add any three multiples of 10 the total must be
a multiple of 10
and
a multiple of 3”
Is she correct?
You must show your working. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| Correct evaluation of the sum of three multiples of 10 where the sum is not a multiple of three and No eg 10 (+) 20 (+) 40 = 70 and No or Correct evaluation of the sum of three multiples of 10 and she is only correct if the total is a multiple of 30 | B2 | B1 for correct evaluation of the sum of three multiples of 10 eg 10 (+) 20 (+) 40 (=) 70 10 (+) 20 (+) 30 (=) 60 |
Additional guidance
| Ignore incorrect evaluations alongside a correct evaluation | |
| The multiples do not have to be different | |
| eg 20 (+) 20 (+) 30 = 70 so she is not correct | B2 |
| eg 10 (+) 10 (+) 10 = 30 or \(3 \times 10 = 30\) | B1 |