Number 7
3 marks · NormalA calculator gives as the answer to . Express your answer as a decimal to three significant figures.
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Show answer
0.423
Common mistakes: 0.42; 0.4231
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Marking points
M1 · 1 mark · Recognises the need to round to 3 significant figures.
M1 · 1 mark · Identifies relevant digits for the rounding.
A1 · 1 mark · Gives final answer as 0.423.
Worked solution
First three significant figures are 4, 2, and 3. The next digit is 1, which is less than 5, so the answer is 0.423.