During math we have been exploring the concepts of greater than, less than, and equal.  We have rolled two dice and used the symbols <, >, and = to compare the two numbers.  During calendar we are collecting different colored cubes each day and creating a graph.  Once the new cubes are added to the graph we have been practicing making statements about the graph, comparing the number of each color.  Another way we  have explored magnitude is by comparing the lengths of different objects and noticing which is longer, through both direct comparison, and by measuring the objects with cubes and comparing the results.  For some reason children always enjoy using the symbols to compare numbers.