### 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.