# Video: Applying Knowledge of the Milli- Prefix

For statements I and II, state for each if they are true or false. I) 3000 milligrams is equal to three grams. II) The prefix milli- means one thousandth. If both are true, state if II is a correct explanation for I. If both are true, state if II is a correct explanation for I

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### Video Transcript

For statements 1 and 2, state for each if they are true or false. 1) 3000 milligrams is equal to three grams. 2) The prefix milli- means one thousandth. If both are true, state if 2 is a correct explanation for 1.

Before we look at this question in depth, note that the SI unit for mass is the kilogram. All other measures of mass, for example, grams and milligrams, are measured relative to the kilogram. 1000 grams is the same as one kilogram. Dividing each side by 1000 gives us one gram on its own. One gram is equal to one one thousandth of a kilogram. Similarly, 1000 milligrams is equal to one gram.

If we divide each side by 1000, we get one milligram is equal to one one thousandth of a gram. If we instead take 1000 milligrams is equal to one gram and multiply each side by three, we get 3000 milligrams is equal to three grams. So, statement 1 is true. Based on one milligram equals one one thousandth of a gram, we can also conclude that statement 2 is true. And statement 2 is indeed a correct explanation for statement 1. So, the last statement is true as well.