(Tries to read through thread)
…
My brain hurts.
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I tried to read the root math problem and pretty sure my brain started on fire.
And then light bulb went off…"why in hell do you need s-root of dollar anyway. XD
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*ten years from now:
Sera67: “OMG! This bomb is going to go off unless I can tell it what the square root of a dollar is! Why oh why didn’t I figure this out all those years ago?”
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I’ll be almost 50, I welcome death! o_o
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To all those who can figure it out
To those that don’t you get @CodeMage nerfhammer
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Then I will see if I can get you a new game system 
FYI that may just kill you too enjoy the ride
P.s. who has or why would you use money to buy that thing I 
all over it from nausea which would cause electric fire which would also kill you that’s one epic death trap ride
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Yeah, most people “pick a side” on that one and choose either 5 cents or 50 cents, but it’s neither, because there’s no such thing as a square root of cent or a square root of dollar. Look at it this way: if you have a square piece of paper that is 10 centimeters on a side, its surface area is 10 cm * 10 cm = 100 cm², so the square root of 100 cm² is 10 cm. However, if someone asked you what’s the square root of 100 cm, they would be asking you for something undefined, because a centimeter is not a square of anything.
Likewise, the square root of 25 cents (or 0.25 dollars) is undefined.
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I honestly thought we might have gone to the same school until you mentioned the teacher in your situation was male. I had a math teacher just like the one you described and it made me crazy
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I’ve heard same from alot of friends and others online. It seems be very wide spread issue. =/
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Years back I gave a little talk to some students as a member of the Boulder Chamber of Commerce. Several of the students during the Q&A asked whether math was important. I said no. Ten of them went “ah ha!” and I continued. I said you don’t need to know math, but when you’re spreading 255 square feet of compost at your landscaping job, you might need to know the concept of square roots.
The whirl of emotions: the banker lady to my left who was horrified that I’d said NO, the enrichment teacher looking like her eyes said “Bravo,” and then about a dozen little lights went on. Instantly they were like “make math practical and we’ll like it.” 
Common Core has been derided by many people who can’t understand it. It’s also derided by former proponents for being overly complicated. At its most fundamental, it tries to give numbers a strong relationship. Here’s a diagram:
Frankly, want to make a kid love maths in his head? Have him play darts with his old man from a very early age, and make him run the chalkboard!
Edit
That’s the Area Model. Problem:
You’re the teacher’s assistant and she needs to know now. The teacher says she only has 847 pages remaining in her printer toner. She needs to print a seven-page booklet for 150 people.
Might she have enough? How many can she actually print?
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There is no lost dollar. Does this make sense @stelagel
50 dollars received by stelagel:
50-5 = 45 USD paid for the ball
2*1.5 = 3 USD given back to the kids
2 USD lost
= 50 USD total
Alternatively:
50 - 3 = 47 USD received out of which 2 lost and 45 spent on the ball.
+++
For the kids:
25 + 25 - 1.5 - 1.5 = 47 USD paid (23.5 each)
From the 47 USD, 45 went for the ball and 2 lost by stelagel. The 47 USD already factor in the lost 2 USD which is why your math doesn’t add up.
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Oh she’s got more than enough to print a seven page booklet that 150 people can look at. She’ll still have 840 pages worth of toner left. 
Or you could go to the supply closet and get another toner cartridge so you don’t even have to worry about it. 
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Simple answer, stop losing those poor childrens money.
I still say it was aliens. . .
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since you like math so much… figure this problem out
The sum of two numbers is 10. Which of the following equations shows that the product of these two numbers is 21?
- x(10+x)=21
- x(10-x)=21
- x(x-10)=21
- 10x=21
which one?
What she doesnt know is that one of the students took butt shots and after 100 the printer jammed. When the student tried to fix it, the rest of the toner bled out into the machine.
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Answer: x (10-x) = 21
Glurin already covered the ‘real-world’ solution. But, assuming they each have to have a separate booklet (different locations, or needing to write their own answers in the booklet or whatever), then I think the answer should be 121.
847 pages available
100 full copies = 700 = 147 pages remaining
20 copies = 140 = 7 pages remaining
1 more copy.
Total number of booklets printed 121.
Estimation and simple maths seem to get an answer that works (but I’ve gone wrong before 
)
I think I finally wrapped my head around @stelagel’s riddle - it’s because the final two euros/dollars should be subtracted from the 47 not added to it. But it seems so reasonable in the description - because they did each wind up paying 23.5 (by a convoluted route, but that’s the amount of money that each was ‘reduced’ by), so it seems so logical that the missing 2 is meant to be added.
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agreed
X=7
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It took me a good while to understand what the hell is going on in that diagram. I guess I’m just going to have to be one of those people who deride Common Core because they don’t understand it and also one of those who think it’s too complicated.
It reminds me of how they taught my kid multiplication in school. See, different people use different tricks and shortcuts, because a specific trick will just “click” for one person and it won’t make sense for another. It’s good to expose kids to those tricks and let them use whatever “clicks” for them. But that’s not what they did. They taught kids those tricks and made them practice them… 
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clap clap, here is an implementation, this is what our brain needs, references …
and he will have good memories increasing the power of these neuronal connections by the magic of the association
unless his old man is a big selfish alcoholic ■■■■■■■, megalomaniac with an inferiority complex wanting to make this part of arrow a formation for world champion with slap in the face
in this case the child will hate math
anyway, we’ve been formatting linear thinking for centuries under the influence of smoking doctrine …
this method will just allow to identify those who have this type of reasoning because they need it
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