Hor Kuok Theng's answer to Shay's Secondary 1 Maths Singapore question.

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Hor Kuok Theng
Hor Kuok Theng's answer
20 answers (A Helpful Person)
1st
When you choose to calculate in metres as opposed to centimeters, there is a chance of losing significant figures (sf) based on the rounding from your calculator.

As such, you can ask your teacher which method is more appropriate in your school. (different schools may have different requirements for significant figures)