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## Early math review

### Course: Early math review>Unit 7

Lesson 3: Comparing and estimating length

# Comparing lengths

Sal uses a ruler to compare the lengths of different objects.

## Video 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.