What method should a medical assistant use to convert weight from pounds to kilograms correctly?

To convert weight from pounds to kilograms accurately, the correct method is to divide the weight in pounds by 2.2. This is based on the conversion factor that 1 kilogram is approximately equal to 2.2 pounds. Therefore, when you want to find out how many kilograms correspond to a certain number of pounds, dividing by this factor yields the correct measurement in kilograms.

For example, if you have a weight of 220 pounds and you divide that by 2.2, you would calculate 220 ÷ 2.2, which equals 100 kilograms. This process reflects the relationship between the two units of measurement, allowing for a precise conversion that health professionals require for medical records, calculations for medication dosages, or any other instances where accurate body weight in kilograms is necessary.

The other methods listed do not provide valid conversions. Multiplying, subtracting, or adding 2.2 would not yield the required information and would lead to inaccurate weight measurements, which are crucial for patient care and medical decision-making.