There are 10 millimetres in one centimetre. Therefore, 18 centimetres is equal to 18 x 10 = 180 millimetres.
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1 yard is equal to 914.4 millimeters.
4 inches is equal to 101.6 millimeters.
1 quart is equal to 946 milliliters.
5.5 meters is equal to 5500 millimeters.
No, 100 centimeters is 1000 milimeters. There are 10 milimeters in 1 centimeter. A centimeter is 1/100 of a meter, and a milimeter is 1/1000 of a meter. So, 100 centimeters is also 1 meter. If you are older than 12, you should know this for math and science.