Lined graphing paper will help your kindergartners draw their graph's axes and the bars and lines that will represent the data they are graphing. You can purchase a notebook of lined graphing paper with perforations so the students can tear out a sheet whenever they need one. The lines of the graphing paper also help determine spacing of the data, such as the numbers along the x and y axes.
A straight ruler can be a useful tool when creating any sort of graph. When your kindergartners plot the data on their graphs, a ruler can help connect dots from one set of data to another and form straight lines for a neater appearance.
Working in pencil allows for your kindergartners to erase any mistakes and correct errors when working on their graphs. Have your kindergartners draw their lines as lightly as possible so that they can go back and correct mistakes easily. Once the graphs are complete, you can help the kindergartners outline the lines of the graph in black ink.
When calculating data for a graph, having a simple calculator can be an advantage for your kindergartners. You can have them add and subtract by hand on a piece of scrap paper, but to save them some time while working on the graphs, passing out calculators for tables to share will eliminate extra time spend doing manual calculations.