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### Course: Grade 6 (Virginia)>Unit 3

Lesson 5: Applying fraction multiplication

# Finding area with fractional sides 2

Learn how to calculate the area of rectangles with fractional side lengths. Watch examples of this concept in action, and then see practice problems applying what was shown to solve similar problems.

## Want to join the conversation?

• What about if the problem had a mixed number in it and no other fraction? How would you solve it, then?
• its simple, all you have to do is multiply it normally
• how does the area be similar to the fractions?
• What does it mean to square a meter.....?
that confuses me.
• Hi Determined!

"A squared metre" means that a square's sides, like the one depicted in Sal's video, are all exactly 1 metre after being measured. "m²" (metres squared), like a symbol, represents this fact (the area) about the square.

For example, let's say you had a big piece of square cardboard in real life. If you took a measuring stick and measured each of it's sides with the result being that each side is one metre in length, then you can use "m²" (1m x 1m) to label its area. Any calculations you do by splitting the "squared metered cardboard" into further fractions uses "m²" to let you know that the sides of the square (and therefore area) are always 1 metre. "m²" just represents the area of the square before it's divided into more fractions like Sal does in this video.

(1 vote)
• I don't understand why the denominator changes when you multiply two fractions and when you add two fractions, the denominator stays the same. For example, 4/5*410=16/50, but when you add 4/5+4/10, it equals 8/5 or 1, 3/5 . How is it different and can you also change the denominator in division and not subtraction?
(1 vote)
• 1m 1m 1m for every side sounds weird?
(1 vote)
• So it's basically like all the sides are 1m 1m 1m 1m?
(1 vote)
• I don't understand 1 meter x 1 meter= 1 meter 2
• When you calculate numbers with units attached to them, you also have to calculate the units.

For example, if you walked 6 feet in 3 seconds, you walked 2 feet each second.
You find that by dividing 6 by 3, which gets you 2,
but you are also dividing 6's unit by 3's unit,
6's unit is feet, and 3's unit is seconds.
So when you have 6/3,
you also have to have feet/seconds, which is the same as 'feet per second'.
And so your answer is 2 feet/seconds, or 2 feet per seond