Learning how to compare the lengths of objects is a second grade, Common Core math skill: 2.MD.4. 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.4 - Measure to determine how much longer one object is than another
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 2.MD.4
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Comparing Object Measurements
This video demonstrates how to measure objects using a ruler and then compares them, finding the difference between them.
First, the video starts by explaining that length-measuring tools can be used to see how long an object is. Common measuring tools include 1) rulers, 2) yard sticks, 3) meter sticks, and 4) measuring tape.
There are two different systems of measurement, each has their own units:
After, the video shows how to use a ruler to compare the length of a red pencil and a blue pencil. Since rulers measure objects in inches, then students will use inches in their answers.
How to measure the length of the pencils:
How to compare the length of the pencils:
The second example compares the length of two cars, using a measuring tape (in meters). The video explains that 1 meter is about 3 feet.
The video shows how to measure the car’s using the meter tape, following the same method used when measuring the pencils.
Video 2: Different Ways to Compare Length
The video starts by stating that one of the most important ways we use measurements is by comparing the length of one object to another. It then poses a question: How can you figure out if your new car can fit into your garage?
To find out, you need to compare the lengths, and to compare their lengths, you need to know the length of each object separately. In this instance, you need to know the length of the car and the length of the garage.
If the length of the car is greater than the garage, then it won’t fit. The video then gives different methods to compare object lengths.
The car fits into the garage in the second example.
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*Information on standards is gathered from The New Mexico Public Education Department's New Mexico Instructional Scope for Mathematics and the Common Core website.