Precision is the number of significant figures that are present in a number. Find out about precision in math with help from an experienced mathematics professional in this free video clip.

### Transcript

Hi, my name is Marija, and today I'm going to give you help with precision in math. Precision is the number of significant figures that are present in a number. So if for example you are given the number 145.372 and you are asked to write this number with a precision of 3, that means that you are only being asked for three significant digits. So I would be writing it as 145 so it's an estimate of the number above. The number as it is written, 145.372 is precise to six digits right, because I have one, two, three, four, five, six significant figures and what I mean by significant figures is any numbers that come after leading 0s and I don't include any 0s afterwards. So these two 0s would not be significant digits. So precision just means the amount of significant digits in a number and if it's less than the amount that's already there then you are rounding it to a specific place and that is precision in math.