How can you work out how many nanometres are in a meter?

Multiply 1000 by 1000 because there are 1000 nm in micrometer and 1000 micrometers in 1mm, then times by 10 because there are 10mm in 1cm, then times by 100 because 100cm in 1m. Answer equals 1,000,000,000 (1 trillion)

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