Grab a measuring device (for example,a school ruler), examine it carefully. You'll see division - some more, others less. Division can be of different colors, some of them signed. At a school meeting, for example, a signed first division - one centimeter.
Make a note the period before the first signed division. Count the number of small divisions in this segment (for example, at a school meeting in the interval, equal to one centimeter is ten small divisions and two additional dividing average value).
Determine the price of the smallest division. To do this, divide the signed value of the first division for a number of small divisions within this segment. At a school meeting, for example, one centimeter should be divided into ten divisions. Get one millimeter. So the price of a small division on the school line is equal to one millimeter.
Now define the price of minor tick marks, if they are on the measuring instrument. For example, at a school meeting, two additional division in one centimetre. Therefore, we need one centimeter divided into two division - will be five millimeters. So the price of a additional division on the ruler is millimeter.
Don't forget that counting division signed division is also necessary to take into account.