The answer is in the question, as they often are. the first and most important thing and engineer or technicial (or anyone living in the modern world) is learn the prefixes for the metric system. The basic ones are very simple. c (cent) = x100 k (kilo) = x1000 M (Meg) = x1000000 G (Gig) = x1000000000 m (milli) = /1000 u (micro) = /1000000 n (nano) = /1000000000 Now look at your question. You have millimeters (mm) and centimeters (cm). Guess what the relationship between them is? Hint, look a few lines up in this answer.
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There are 90 millimeters in 9 centimeters. This is because there are 10 millimeters in a centimeter, and 9 multiplied by 10 equals 90.
1 centimeter = 10 millimeters
2 centimeters = 20 millimeters
9 centimeters = 90 millimeters
8389 centimeters is equal to 83 meters and 89 centimeters. 9000 millimeters is equal to 9 meters.
There are 10 millimeters in one centimeter, so 0.9 centimeters is equal to 9 millimeters.
There are 9 centimeters in 90 millimeters. This conversion is based on the fact that 1 centimeter is equal to 10 millimeters.
There are 900 millimeters in 90 centimeters. This is because there are 10 millimeters in 1 centimeter.
90 mm is equal to 9 centimeters because 1 centimeter is equal to 10 millimeters.