Final answer:
To convert milligrams to grams, divide the number of milligrams by 1000 or move the decimal point three places to the left. For example, 456 mg becomes 0.456 g. Conversely, to convert grams to milligrams, multiply by 1000 or move the decimal point three places right, making 4.56 g equal to 4560 mg.
Step-by-step explanation:
To convert milligrams to grams, a fundamental concept in metric unit conversion is applied. If we take the example of converting 4.56 g to milligrams, we need to multiply by 1000 because there are 1000 mg in 1 g. The calculation would be as follows: 4.56 g × 1000 = 4560 mg.
The reverse is also true; to convert from milligrams to grams, you must divide by 1000 or move the decimal point three places to the left. Hence, 456 mg would convert to grams as follows: 456 mg / 1000 = 0.456 g. Remember, multiplying or dividing by 1000 is equivalent to moving the decimal point three places right for multiplication or three places left for division.