Building on the work in Topic E, students now connect the process of measuring to displaying data on line plots. In Lesson 23, students measure their own handspan (i.e., the distance from the tip of the thumb to the tip of the pinky with hand fully extended), as well as those of five friends, rounding the lengths to the nearest whole inch. They then share the data as a class. Using tally marks, students create a table to record and organize the data.
In Lesson 24, students display the data from the previous day’s table on a line plot, where the measurements are shown on a horizontal scale marked off in whole inches (2.MD.9). Then, they generate new data by measuring shoe lengths in centimeters. They make a line plot to display this data by using their rulers to mark off whole centimeters. As they create the line plot, students relate their line plot back to the centimeter ruler and the centimeter ruler to a number line.
Finally, in Lessons 25 and 26, students are presented with different data sets, which they represent using line plots (2.MD.6). They then discuss the results and learn how to interpret the data. They infer and draw conclusions from the data set and representations, discovering that, while a table is useful for organizing data, a line plot allows for the visual comparisons of the different quantities.
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