Foundation June 2024 Paper 3 Q22
22 Find the highest common factor (HCF) of 63 and 105 (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| 21 | M1 | for a complete factor tree for 63 or 105 with no more than one arithmetic error or for listing at least 4 correct factors (with no more than 1 incorrect) of 63 or 105, could be in factor pairs or for the prime factors of 63 (3, 3, 7) or 105 (3, 5, 7) |
| A1 | cao | |
| SCB1 for answer of 3 or 7 or \(3 \times 7\) if M0 scored |
Additional guidance
Condone the inclusion of 1 for this mark
May be seen in different ways,
1, 3, 7, 9, 21, 63
1, 3, 5, 7, 15, 21, 35, 105
Prime factors may be seen in a diagram eg a Venn diagram