Learning how to add and subtract within units of measurement is a second grade, Common Core math skill: 2.MD.5. Below we show two videos that demonstrate this standard. Then, we provide a breakdown of the specific steps in the videos to help you teach your class.
Your students will have learned how to measure objects through non-standard units, like using paperclips to measure a pencil (1.MD.1). They should also be able to compare objects using terms like longer, shorter, longest, and shortest (1.MD.2).
In the future, understanding how to measure objects with a ruler will help your students expand on and apply the concept elsewhere. Students will be able to make a line plot, measure objects, and place those measurements on the plot (2.MD.9). Your students will also be able to use rulers marked with halves and fourths of an inch (3.MD.3) and apply “linear measurement to measure perimeter and area” (3.MD.5- 8).
Common Core Standard: 2.MD.5 - Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 2.MD.5
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Rules on Adding and Subtracting Units
This 1 minute video shows how to subtract units from a measurement and provides some rules about adding and subtracting with measurements.
The video begins by explaining that when measuring things, you sometimes want to add or subtract from the measurement. The video then gives a hypothetical scenario:
The video then explains that students must write inches next to each number, and the equation would not work if one of the units changed.
Video 2: Add Measurements by Solving a Word Problem
The video briefly explains what it is about and then moves straight into the problem. The word problem is below:
“Jean and Peter are assembling a model train set. Jean puts down 10 feet of a red track. Peter then puts down 12 feet of a blue track. How long is the train track in all?”
The video explains that you can add units of measurement the same way you add numbers.
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