Compare Metric Lengths Video
Let’s watch a video about comparing metric lengths.
Goal:
Goal:
Learn!
Goal: Learn how to compare metric measurements using subtraction.
The student in this video is learning how to compare toys using the metric system. Can you help the student use subtraction to compare the toys? Click the video below.
T: Welcome to class! What do you see on your desk?
S: I see two toy robots.
T: Can you describe the robots to me?
S: Sure! This robot has a round head and it’s yellow. This robot has a square head and it’s grey.
T: Great job! Today we will measure toys in centimeters. Which side of my ruler shows centimeters?
S: Centimeters are marked at the top of your ruler.
T: How do you know that these are centimeters and not inches?
S: Centimeters are smaller than inches.
T: Clever! Can you measure the height of each of these robots in centimeters?
S: Sure! I just line up the bottom of the robot with the first line of the ruler. The yellow robot is 26 centimeters tall.
T: How tall is the grey robot?
S: The grey robot is 21 centimeters tall.
T: Which robot is taller?
S: The yellow robot!
T: How much taller is it than the grey robot?
S: Ummm, it’s just a little bit taller.
T: Remember, we can find out exactly how much taller it is by subtracting the measurements. What is 26 centimeters minus 21 centimeters?
S: 26-21=5. The yellow robot is 5 centimeters taller than the grey robot!
T: That’s right! Let’s look at the Legos on your desk now. What do you notice about them?
S: The blue Lego brick is very long, and the orange Lego brick is a little shorter.
T: That’s right! Can you measure them?
S: Sure. The blue Lego brick is 18 centimeters long, and the orange Lego brick is 11 centimeters long. I can find the difference!
T: What subtraction sentence will you use?
S: I’ll use 18-11. 18-11=7. The blue Lego brick is 7 centimeters longer than the orange Lego brick!
T: You’re getting the hang of it now!
S: Yes! Can I try measuring the car and the bus now?
T: Sure!
S: This big bus is 30 centimeters long. That’s the entire length of the ruler! The car is 16 centimeters long.
T: Go ahead and compare their lengths now.
S: Okay. I’ll subtract 30-16. 30-16=14. That means the bus is 14 centimeters longer than the car.
T: You’re exactly right! You can use subtraction sentences to compare the length or height of different objects.
Which subtraction sentence describes how much taller the cotton candy stand is than the dollhouse?
Click image to enlarge
Good job! The cotton candy stand is 2 meters tall, and the dollhouse is 1 meter tall.
The cotton candy stand is 2 meters tall, and the dollhouse is 1 meter tall, so 2 - 1 = 1.
The cotton candy stand is 2 meters tall, and the dollhouse is 1 meter tall, so 2 - 1 = 1.
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