O-LevelMathematicsNumber4024/12 · May/June 2019 · Q123 Marks
Write these numbers in order of size, starting with the smallest. 2.1 × 10⁻³ 4.2 × 10⁻⁴ 1.7 × 10⁻⁵ 3.5 × 10⁻⁴
- (a)Write these numbers in order of size, starting with the smallest. 2.1 × 10⁻³ 4.2 × 10⁻⁴ 1.7 × 10⁻⁵ 3.5 × 10⁻⁴[1]
- (b)(i)P = 6 × 10¹⁰ Q = 5 × 10⁹ Evaluate the following. Give each answer in standard form. P - Q[1]
- (b)(ii)PQ[1]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] (a) 1.7 × 10⁻⁵, 3.5 × 10⁻⁴, 4.2 × 10⁻⁴, 2.1 × 10⁻³
- [1] (b)(i) 5.5 × 10¹⁰ cao
- [1] (b)(ii) 3[.0] × 10²⁰ cao
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