Foundation June 2025 Paper 1 Q19
19 Find the highest common factor (HCF) of 54 and 120 (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| 6 | M1 | for a complete factor tree for 54 or 120 with no more than one arithmetic error or for listing at least 4 correct factors (with no more than 1 incorrect) of 54 or 120, could be in factor pairs or for the prime factors of 54 (2, 3, 3, 3) or 120 (2, 2, 2, 3, 5) |
| A1 | cao | |
| SCB1 for an answer of 2 or 3 or \(2 \times 3\) if M0 scored |
Additional guidance
Condone the inclusion of 1 for this mark
Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54
Factors of 120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
Prime factors may be seen in a diagram eg a Venn diagram