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## 7th grade (Illustrative Mathematics)

### Course: 7th grade (Illustrative Mathematics) > Unit 1

Lesson 4: Lesson 5: The size of the scale factor# Interpreting scale factors in drawings

Sal interprets a scale factor to determine if a scale copy will be larger or smaller than the original figure.

## Want to join the conversation?

- Hmmm. I see math is made up of math(28 votes)
- this makes no sense to me i feel so stupid(11 votes)
- are yall real humans(0 votes)
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Of course, we're real bro, I once thought youtubers were fake at first when I was a younger man how I missed those times.(16 votes)

- In the last practice theres no way to tell if you have to use whole numbers or fractions this is stupid.(3 votes)
- Actually, that is not true. You use fractions when you are scaling down, and whole numbers when scaling up.

Hope this helps!(3 votes)

- Am I the only one who thinks this is super easy?(4 votes)
- I am still unsure about the scale factor... Could you please explain it in a simpler way please? My brain is not functioning today. (¬_¬")(4 votes)
- has confusion...and regrets going ahead on 6th grade(3 votes)
- Ahh yes, the amount of sense this makes is below zero(3 votes)
- MATH IS MATH (laghter sound)(2 votes)
- thats not how you spell laughter, i guess you're losing too much brain cells watching this(1 vote)

## Video transcript

- [Instructor] We are told
Ismael made a scaled copy of the following quadrilateral. He used a scale factor
less than one, all right. And then they say what could be the length of the side that corresponds to AD? So AD is right over here. AD has length 16 units in
our original quadrilateral. What could be the length of the side that corresponds with
AD on the scaled copy of the quadrilateral? So it's a scale factor less than one. So we're gonna get something
that is less than 16 for that side. And the rest of it will all
be scaled by the same factor. So the resulting quadrilateral
might look something, might look something like this. This is just my hand-drawn version. So the key realization is is if our scale factor is less than one, this thing right over here is going to be less than 16 units. So let's look at the choices. And it says choose three answers. So pause the video. Which of these would match if we're scaling by a
factor of less than one? Well, we just have to see which of these are less than 16 units. This is less than 16. This is less than 16. This is less than 16. And those are the only
three that are less than 16. 32 units, this would be
a scale factor of two. 64 units, this would be
a scale factor of four, clearly a scale factor
that is not less than one.