25 mm (or 2.5 cm) is already in a standard (metric) length.
(Or 25mm is the equivalent to 0.984251969 inches.)
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If you have a length of 25 mm and then 12 mm it makes a length of 37 mm.
To convert centimeters to millimeters, you need to multiply by 10 since there are 10 millimeters in 1 centimeter. Therefore, if the thermometer is 25 cm long, you would multiply 25 by 10 to get the length in millimeters. The length of the thermometer in millimeters would be 250 mm.
23.5 millimetres is exactly 23.5 mm in length!
there are a million things 3cm long like bugs, some bones in your fingers, a piece of string or paper cut to that length, etc.
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