O-LevelMathematicsNumber4024/11 · Oct/Nov 2019 · Q133 Marks
Write the number 0.00023 in standard form.
- (a)Write the number 0.00023 in standard form.[1]
- (b)Evaluate 8 × 10⁹ – 9 × 10⁸. Give your answer in standard form.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [1] 2.3 × 10⁻⁴ cao
- [2] 7.1 × 10⁹ cao
- B1 for answer figs 71
- or for answer A × 10⁹ with 1 ≤ A < 10
- or M1 for 80 × 10⁸ or for 0.9 × 10⁹
- or both numbers adjusted to other appropriate powers of 10
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