How many millimeters are there in 100 centimeters?

To determine how many millimeters are in 100 centimeters, it's essential to understand the relationship between centimeters and millimeters. One centimeter is equal to 10 millimeters. Therefore, to convert centimeters to millimeters, you multiply the number of centimeters by 10.

In this case, if you have 100 centimeters, you calculate the equivalent in millimeters as follows:

100 centimeters × 10 millimeters/centimeter = 1000 millimeters.

Thus, there are 1000 millimeters in 100 centimeters, which confirms that the correct answer is indeed the first choice. This knowledge is crucial in medical situations where accurate measurements are necessary for dosing medications or measuring dimensions accurately.