First, we will look at a ruler.  We will note all the lines between the numbers.  Then we will draw and label those lines to identify each line.  This will include a discussion of fractions as each line represents a fraction of the space between the lines.  Next, we will learn what a starting point in measuring is. Not all rulers start at the end.  Some have a small space before the starting mark of zero.  Then we will read the ruler and measure several items I have pictured.  Finally, we will go on a scavenger hunt to find items of a given length.