About this video
The video measures pairs of shapes and lines, then compares them. To say how much longer or shorter one is, you find the difference between the two lengths, such as 9 - 5 = 4 centimeters longer.
You'll be able to
- read a length from a ruler in centimeters.
- find how many centimeters or meters longer or shorter one length is than another.
- choose the word longer or shorter correctly when comparing lengths.
Key words
- meter
- A unit for measuring length that is much longer than a centimeter.
- centimeter
- A small unit of length marked on a ruler.
- width
- How wide something is from side to side.
- compare
- To look at two things and say which is longer or shorter, and by how much.
Transcript
- Rectangle 1 is blank meters blank than Rectangle 2. Let's look at this. Rectangle 1 has a width of 3 meters. Rectangle 2 has a width of 9 meters. Rectangle 1 is, if you compare 3 to 9, it's going to be 6 meters shorter. 6 meters shorter than Rectangle 2. You see that right over here, because 3 meters is 6 less than 9 meters.
It's 6 meters, and you know it's not going to be longer. Rectangle 1 is definitely ... it has less width. It's definitely shorter than Rectangle 2. It's 6 meters shorter than Rectangle 2. Let's do a few more of these. Line 1 is blank centimeters long. We can measure it.
We could measure it right over here. Line 1 is 9 centimeters long. 9 centimeters long. Line 2 is blank centimeters long. Let me actually zoom this in a little bit so that we can see it a little bit better. Line 2 is blank centimeters long. Line 2 is 5 centimeters long.
Let me zoom in a little bit more even. Line 2 is 5 centimeters long. Line 1 is blank centimeters blank than Line 2. Well, Line 1 is 9 verses 5, so it's 4 centimeters longer than Line 2. Line 1 is 4 centimeters longer than Line 2. You can see it right over here.
To go from Line 2 to Line 1, you'd have to add 1, 2, 3, 4 centimeters. Let's do a few more of these. Triangle 1 is blank centimeters long. We can just use a ruler to measure that it's 3 centimeters long. Triangle 2 is blank centimeters long. Let me scroll down to look at Triangle 2.
Triangle 2 is 5 centimeters long. Triangle 2 is 5 centimeters long. Triangle 1 is blank centimeters blank than Triangle 2. Well, Triangle 1 is 2 centimeters shorter than Triangle 2. 3 is 2 less than 5. It's going to be 2 centimeters shorter. Remember, Triangle 1, we see it's shorter it's smaller than Triangle 2, so it makes since that it's shorter.
How much shorter? 2 centimeters because 3 centimeters compared to 5 centimeters. Let's do one more of these. Rectangle 1 is blank centimeters long. We can just look right over here. It's 9 centimeters long. We have one end of the ruler at one end of the rectangle, and then we just measure off 9 centimeters.
Rectangle 2 is, well, it looks like it's 6 centimeters long. 6 centimeters long. Rectangle 1 is longer, and it's 3 centimeters longer than Rectangle 2. 9 centimeters is 3 centimeters more than 6 centimeters. It's 3 centimeters longer. Rectangle 1 is the longer Rectangle.
Then, we're done.
Video © Khan Academy, used under CC BY-NC-SA. Watch on Khan Academy. Puzzicle is not affiliated with Khan Academy.