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'deci' is a prefix meaning 1/10 or 0.1.

'milli' is a prefix meaning 1/1000 or 0.001.

1 decimetre (dm) = 0.1 m

40 dm = 40 × 0.1 m = 4 m

1 millimetre (mm) = 0.001 m

Therefore, 1 m = 1000 mm

40 dm / 1 mm

= 4 m / 0.001 m

= 4000 mm

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12y ago

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