Learning how to measure objects using a ruler is a second grade, Common Core math skill: 2.MD.1. 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.1 - Measure the length of an object by selecting and using appropriate tools: rulers, yardsticks, meter sticks, and measuring tapes
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 2.MD.1
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Measuring with Centimeters
The video begins by explaining that you can measure the length of objects using tools, such as a ruler. The ruler in the video uses centimeters to measure the length of various objects.
First, the video explains how to read the ruler.
The first example is of a pencil. When one end of the pencil is aligned with 0, you can see that the pencil is 7 centimeters long. It then asks viewers if they can still measure the pencil with a broken ruler.
The video shows another example demonstrating the difference method discovered above: One way to find the length of an object is to align it with two numbers on a ruler and find the difference.
Video 2: Measuring Fabric and Objects
The video starts by explaining how a ruler works. A ruler has two different sides: inches (in) and centimeters (cm). The video practices using inches first by helping out Nora who wants to make clothes for her doll.
The video then provides examples for using centimeters, stating that the centimeters side works the same way as the inches side. The viewers are then asked how long some objects are in centimeters.
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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.