O-LevelMathematicsNumber4024/12 · May/June 2019 · Q154 Marks
Write 168 as a product of its prime factors.
- (a)Write 168 as a product of its prime factors.[2]
- (b)The highest common factor of 168 and N is 42. Given that 200 < N < 300, find the two possible values of N.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [2] (a) 2 × 2 × 2 × 3 × 7 or 2³ × 3 × 7
- [B1] for 2, 2, 2, 3, 7 as factors
- [M1] or for any two stages correct in factor tree or ladder method
- [2] (b) 210 and 294 only
- [B1] for one correct value seen
- [B1] or for answers 2 × 3 × 5 × 7 and 2 × 3 × 7²
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