Before You Begin this Unit…  
Unit at a Glance 
This unit builds on the measurement and data work of first grade. Students in first grade measured the length of objects by laying multiple copies of samesize units (nonstandard) end to end with no gaps or overlaps. Students also compare up to three objects by ordering the objects by length. First grade students organize data, and then represent data and answer simple questions about the data. First grade representations are not formal graphs. It may be as simple as drawing three circles with the number of items in each category or recording student names in a table. In this unit, students will shift from nonstandard units of measure to using standard units such as inches. Students will also move to formal graphs and use bar graphs and pictographs to represent their data. Both types of graphs should include scales in increments of one and symbols that represent one. Students move to scaled bar graphs and pictographs in which the symbol represents more than one as part of their multiplication unit in third grade. 
Suggested Dates: *Access the performance task for this unit Create a TV Show 

Standards Addressed in the Unit  
2.MD.1 Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes. 2.MD.2 Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen. 2.MD.3 Estimate lengths using units of inches, feet, centimeters, and meters. 2.MD.4 Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit 2.MD.5 Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, e.g., by using drawings (such as drawings of rulers) and equations with a symbol for the unknown number to represent the problem. 2.MD.6 Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent wholenumber sums and differences within 100 on a number line diagram. 2.MD.7 Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. 2.MD.8 Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $and ¢ symbols appropriately. Example: If you have 2 dimes and 3 pennies, how many cents do you have? 2.MD.9 Generate measurement data by measuring lengths of several objects to the nearest whole unit, or by making repeated measurements of the same object. Show the measurements by making a line plot, where the horizontalscale is marked off in wholenumber units. 2.MD.10 Draw a picture graph and a bar graph (with singleunit scale) to represent a data set with up to four categories. Solve simple puttogether, takeapart, and compare problems^{*} using information presented in a bar graph. *See Unpacking Document Glossary, Table 1. Link to CCSS Unpacking Document 