O-Level E-Maths Practice Questions - Singapore-Cambridge GCE Ordinary Level Mathematics (Elementary Mathematics, Syllabus 4052) Exam

Express 0.00045 in standard form.

4.5 × 10^-3 45 × 10^-5 4.5 × 10^4 4.5 × 10^-4

Correct Answer:

4.5 × 10^-4

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