Determining significant digits

We looked at Colin’spost. Then we go a handout telling us some rules about significant digits.Absent is when there is no decimal and you start on the right and move lefttill you see the first number between 1-9 and then count to the end. Present iswhen there is a decimal and you start on the left and move right till you seethe first number that is not a 0 and count to the end.http://www.youtube.com/watch?v=-QvtNvOACaU