O-LevelMathematicsNumber4024/12 · Oct/Nov 2022 · Q103 Marks
Write 420 as the product of its prime factors.
- (a)Write 420 as the product of its prime factors.[2]
- (b)Given that 1512 = 2³ ×3³×7, find the highest common factor of 420 and 1512.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [2] 2² × 3 × 5 × 7 or 2 × 2 × 3 × 5 × 7
- B1 for list 2, 2, 3, 5, 7
- or M1 for any two stages correct in factor tree or ladder method
- [1] 84
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