O-LevelMathematicsNumber4024/12 · May/June 2021 · Q104 Marks
Write 270 as the product of its prime factors.
- (a)Write 270 as the product of its prime factors.[2]
- (b)Find the highest common factor (HCF) of 270 and 225.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [2] (a) 2 × 3³ × 5
- [2] (a) B1 for 2, 3, 3, 3, 5 not as product or M1 for any two stages correct in factor tree or ladder method
- [2] (b) 45
- [2] (b) M1 for [225 = ] 3 [×] 3 [×] 5 [×] 5 or for [HCF = ] 3 × 3 × 5 seen
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