Learning how to estimate the length of an object without using measuring tools is a second grade, Common Core math skill: 2.MD.3. 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.3 - Estimate lengths using units of inches, feet, centimeters, and meters
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 2.MD.3
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: Estimating Different Lengths
The video begins by explaining that people can measure things, both big and small. Then, different ways of measuring (without using measuring tools) are explained and depicted.
First, the video discusses the inch.
Next, the video discusses the foot.
Next, the video discusses the meter.
The last measurement is the centimeter.
Video 2: Which Measurement is Best?
This video offers 2 word problems about measurement for students to solve. It walks students through the reasoning and estimates the lengths of both a small and large item.
First, the video explains that students will be estimating lengths with customary units: inches, feet, and yards.
The first question is, “Which customary unit of length would you use to measure a DVD case?”
Reasoning Points: 1) height of a DVD case is a small measurement; 2) feet or yards would be too big, so using inches is the best choice.
The second question is, “Which customary unit of length would you use to measure a basketball hoop?”
Reasoning Points: 1) The height of a professional basketball hoop is too big to use inches; 2) the hoop is larger than a person, so using yards (the biggest unit) is the best choice.
The video ends, reminding students that they learned to estimate the length of objects using customary units.
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