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## Numbers & Operations - The Real & Complex Number Systems 211-217

### Course: Numbers & Operations - The Real & Complex Number Systems 211-217>Unit 6

Lesson 5: Area of rectangles with fraction side lengths

# Finding area with fractional sides 1

Learn how to calculate the area of rectangles with fractional side lengths. Watch examples of this concept in action and practice applying it to different problems. The video emphasizes understanding the process, not just getting the answer.

## Want to join the conversation?

• I STILL DONT GET IT they lose me at when they did the squares
• Sal showed 2 ways to figure out the area or the square

1): multiplying the width and height

2): is to take the numerator(the top number) of each fraction, and use that to make a grid.
Example: 5/9 is the height so top to bottom Sal separated the area into 5 sections
after doing that with height and width it made a grid each square being 1/9 by 1/8

He figured out the area by multiplying 1/9 by 1/8 (Which is 1/72)

then sal figured out the number of squares by multiplying the number top to bottom then left to right (height by width) that being 7x5(35)

and at the very end multiplied the number of squares (35)by the area or each squares(1/72) that is 35/72

(The thing about meters squared is just a poor example you don't have to understand it)
• When you are multiplying the height and width are you finding the area or the perimeter?
• You are finding the area width*height=Area
Perimeter=2*width+2*height
• I don't understand the relationship of 8 and 9.
7x5 seems logic however where did you get 8/9 from?
(1 vote)
• clarify why you split the rectangle into 35 equal parts. It seems random. Please point out that you are using the numerators of both fractions to divide it into equal parts and why.
• Because of the following reason:
Let us pretend this is an addition
You can't do 7/8 + 5/9. The denominators are different. So you will find the MCP. The same is with multiplication.

(1 vote)
• do you do the same thing for LxWxH?
• Wait is it like a fraction times a fraction
• clarify why you split the rectangle into 35 equal parts. It seems random. Please point out that you are using the numerators of both fractions to divide it into equal parts and why?...
• Because of the following reason:
Let us pretend this is an addition
You can't do 7/8 + 5/9. The denominators are different. So you will find the MCP. The same is with multiplication.

(1 vote)
• Wouldn't it be easier to just count the side lengths then multiply?