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6 th grade math problem

3

37 chief

Well-known Member
Making a step. The form is 20 inches x 20 inches x 6 inch deep. How many sq ft of cement will I need. Thanks, Stan
 
"[b:654c4848f0][i:654c4848f0]How many <a href="https://www.google.com/search?client=firefox-b-1-d&q=formula+for+square+feet">sq ft</a>[/i:654c4848f0][/b:654c4848f0]"

( 20" x 20" ) / ( 12" x 12" ) =

( 400" ) / ( 144" ) = 2.78 sq ft of surface area
 
I'm thinking I would have known you need cubic feet rather than square feet back when I was in 6th grade. Dad was a builder, and by 6th grade, he had me doing most of the math when he was working up bids.
 
You can do that in your head.

20 x 20 = 400 sq inches
There are 144 square inches in a square foot. Round that to 150.
150 goes into 400 about 2.7 times.
6 inches is half a foot, so divide 2.7 by 2 gives you 1.35, round that to 2.4 cubic feet.
 
Was taught at some point, not sure when but pressed to guess Id say middle school or as we said back then Jr High. I retained it because it interested me,, now if we go to proper English and spelling then I am as lost on that subject as the OP is with math, LOL.
 
If it were me, I'd make it 36" x 36" x 36" deep.

That would be 1 yard x 1 yard x 1 yard.

On most days that would be 1 cubic yard of CONCRETE.

LOL Larry
 
(quoted from post at 07:38:29 11/10/20) Surprising how many people don't seem to know the difference between concrete and cement.
Click to expand...
o the masses, it does not matter.
 
After reading all the answers, I wasn’t going to post. But then I got to thinking of my 6th grade teacher, Sister David. Don’t know if Sister David could have figured it out without the "teachers book" with the answers. I think Shawn Wallace has the best solution, although he did not answer the problem as asked.
 
So what is the difference between cement and concrete. Both are hard when set and dry and both sloppy and mushy when before set while wet.
 
(quoted from post at 07:36:19 11/10/20) So what is the difference between cement and concrete. Both are hard when set and dry and both sloppy and mushy when before set while wet.
Click to expand...

Take a bag of Portland Cement. Mix water, sand, and rock in with it. You now have concrete.
 
cement is the powder that glues all the aggregates together to make a homogeneous concrete--It also is the basis for the chemical action called hydration in concrete
 
(quoted from post at 09:16:21 11/10/20) 2 sacks should do it. 80# sacks of redi-mix.
Click to expand...

An 80lb bag is only .6 cu ft so it will really take 3 bags to make 1.388 cu ft.

2 will not be quite enough.
 
Had a retired civil engineer friend, one of his favorite chuckles lines was " some people pour cement, I like to place concrete "
 
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