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### Course: 5th grade (Eureka Math/EngageNY)>Unit 5

Lesson 3: Topic C: Area of rectangular figures with fractional side lengths

# 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
• What does it mean to square a meter.....?
that confuses me.
• When you "square" something by adding a ² at the end, it means you have multiplied the variable attached by itself.
So, say 2 is J. Then J² would be 2 x 2, or 4.
Hope this helps,
BIOHAZARD, The One and Only Radioactive Coder
• 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?
• because they are different operations your doing different things so different protcals
(1 vote)
• in the quiz, how do you know what the amount of boxes is in the square?
• Why is 3/7 x 9/10 27/70?
(1 vote)
• 3/7 x 9/10=27/70 because when you multiply fractions you multiply the numerators (the top numbers)with each other and you multiply the denominators (the bottom numbers) with each other to get your answer. So 3 x 9=27
7 x 10=70
• how can the rectangles within the square be 1mx1m if they r RECTANGLES??
(besides this, the vidio is easy to understand)
(1 vote)
• Each small rectangle is 1/7 m long x 1/10 m wide.
it's just that we divided the big square into 7 rows and 10 columns. We could've made number of rows and columns be the same so that each rectangle is now a square.
• I still don't know and understand what 1 1/2 times 2 m is? How do I figure this out?
(1 vote)
• whenever you multiply a fraction by a whole number, you multiply the whole number by the fraction's numerator. For instance, take 3/5 times 4. Because the 3 is the numerator, you would do: 3 times 4, which equals 12, right?
Now, you simply put the numeratior back where it goes, getting 12/5, and there's your answer. There you can simplify it or whatever, like make it 2 2/5 or whatever, but that's separate.
• so at you mentioned the area. do you always have to put in the cm2 so then it also can be feet2 or m2 or inch2?
• Yes. If the length of the square is 1 foot and the width of the square is 1 foot, then the area of the square will be 1 foot squared.
• 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