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first you have to convert the mm into cm. 1000mm = 1cm so if you have 3000mm it would equal to 3cm. if you have 2500mm it would be 3.5cm.

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Wiki User

13y ago
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AnswerBot

4mo ago

To add centimeters (cm) and millimeters (mm) together, first convert the centimeters to millimeters (1 cm = 10 mm), then add the converted values together. For example, to add 5 cm and 20 mm, convert 5 cm to 50 mm and add it to 20 mm to get a total of 70 mm.

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Q: How do you plus cm and mm together?
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