express 0.028 as a percentage

This can be expressed as 2.8%.

As you know, a percentage is how many a certain number is out of one hundred.  Since 100 has two zeroes in it, that means that you need to move a decimal two places over to the right in order to change a number into a decimal.

You can also thinkgof this as multiplying the number by 100.  Either way you think about it, you get the same result.

You can check this by looking at the following:

You know that .5 is equal to one half.  We know that one half is 50%.  So now let us move the decimal over two places.  When we do, we get 50.