1 centimeter is equal to 10 millimeters.
To convert 18 centimeters to millimeters, you can use the following steps:
Step 1: Multiply the number of centimeters by 10 (since 1 centimeter is equal to 10 millimeters).
18 cm x 10 = 180 mm
Therefore, 18 centimeters is equal to 180 millimeters.
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