Number 2
3 marks · NormalCalculate (7.2 × 10^{-3}) ÷ (1.8 × 10^{2}) and give your answer in standard form.
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4 × 10^{-5}
Also accept: 4.0 × 10^{-5}
Common mistakes: 4 × 10^{-1}; 40 × 10^{-4}
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Marking points
M1 · 1 mark · Divides the numbers: 7.2 ÷ 1.8
M2 · 1 mark · Subtracts indices: -3 - 2 = -5
A1 · 1 mark · Gives final answer in standard form: 4 × 10^{-5}
Worked solution
Divide the numbers and subtract the powers.
7.2 ÷ 1.8 = 4