Read the stem side of the graph to determine the place value of your digits. The leaves are always the ones place, but the stem can be 10s or 100s. If the value of the stem is 10s there will be only one digit per row, such as one, two, three representing 10, 20 and 30. If the value of the stem is 100s there will be two digits per row, such as 10, 11, 12 representing 100, 110 and 120.
Read the leaf side to determine the total number of each ones place value. For example, if in your first row of your leaf you have six ones, 1+1+1+1+1+1, you know you have six numbers that end in one. This will help you determine landmarks such as median and mode.
Combine the stems and leaves of each row to determine the overall value of the digits. For example, if in your stem you have the number five and in your leaves you have one, two, three, four and five, when you combine the stem and the leaf you have 51, 52, 53, 54 and 55 because your stem equals the 10s place and the leaves equal the ones place.
Write out all of the digits in your graph after combining the stems and leaves to help you better visualize the numbers.