Common Core Teacher Takes Nearly a Minute to Solve 9+6=15

[gixxer0.6g]

In on common core propaganda hate thread.

[Dan916]

Why do I have a feeling Democrats/Libtards are to blame?

[unstrong]

This is called conceptual learning, and it's how smart people generally learn. It's a larger upfront investment that pays dividends over memorization because it can be generalized and expanded.

Proving that 9+6 and 10+5 are equivalent is smart because it shows how sets and numbers work. Making bigger sets (in this case, a 10s set) makes it easier to add. So, you take 1 from the 6 and combine it with the 9 to make an easy-to-use 10.

Extrapolate this out to a harder problem, say 768+349. If you use a similar method of making these bigger sets here, this problem is easy to solve in your head. 700+300=1000, 60+40=100, 8+9=17 (or 8+9=10+7=17), so the answer is 1117. If you tried to do long-form addition in your head, this would be a pain in the ass.

This kind of thinking sets kids up to be able to do stuff like that easily, because it really is not difficult to add big numbers in your head if you learn to think about big numbers in this way.

For the record I think the overall concept of common core is dumb but teaching methods like this do make sense.

[Enigmal]

This is actually better than just having kids memorize that 9+6=15. It also provides a solid foundation for moving into multiplication in which 15x12 can be calculated by doing
15x10 = 150
15x2 = 30
150 + 30 = 180
They're just trying new ways for kids to learn math...not the end all be all fellas.

[gixxer0.6g]

This. It's about teaching kids mental strategies that simplifies computation and reduces cognitive strain, freeing resources for more advanced mental operations.

If that were the case they would give you one of these and you'd graduate.

[kraxxis]

I don't see what's wrong with this method. Most of us don't learn the fastest way as the first way. Sometimes it's easier to break something down into more familiar parts to fully understand before you start teaching it with speed. That is how I do multiplication problems in my head.

29x24=?

I do:
30x24=720
1x24=24
720-24=696

The technique is just round up than adjust accordingly.

[stevesteve12]

It is completely obvious. I learned all multiplication and addition tables by 3rd grade.
I mean, it is the most obvious thing in the world.

lol u dumb chimp is that suppose to be an accomplishment.

all the chinese students HAD to master the multiplication table before the 1st grade

o and no periodic table / formula sheets none of that bull**** ever

[sozwut]

the fuk are you retards complaining about? all she did was break down a number into two smaller, easier to add numbers. I guarantee this is how most people do certain calculations in their head

[spartansgolfers]

Here's how my 10 year old was taught to multiply. She was taught regular long multiplication as an alternative to this and glossed over it.

Dafuq. That seems so arbitrary with regards to what direction/where you draw the initial lines, how you plot up the groups, and that "carry the 1" that could go anywhere

[Enigmal]

If that were the case they would give you one of these and you'd graduate.

But that lowers the amount of firing synapses in the brain meaning less cognitive development and poorer problem solving skills later in life.

[The_Albatross]

once again the misc cannot come to a consensus in regards to doing math.

[unstrong]

it's still stupid. if you were to ask miscers that question, 90% of us would do it as

15x10 + 15x2 = answer

none of us were taught that, it's just common sense that you learn by yourself at like 12 if you aren't retarded

and that's large number multiplication, not addition. addition is 100x easier.

So you'd rather have kids wait until they figure out a better way to do something at 12 instead of teaching them to do it the better way at 7?

I just don't even...

[MrLL]

Mind is boggled that this method isn't already common knowledge.

[kenonator]

Common core is so bad I don't know what moron thought it was a good idea to put this chit in schools but my guess is there is a company lobbying their bull**** to the department of education(which is also useless and should go away).

[unstrong]

refer to miscmathematician's post a few posts up.

there's no point in teaching this. 9+6 should be as easy as 9+6, not requiring memorization of a convoluted system that makes it 2x as hard as it should be

The point is not to teach them the best way to solve 9+6, it's to teach them to solve 768+347 in 5 seconds or less. See above.

Better to practice learning how math actually works from the start rather than leave kids behind and back on them to "figure it out" later on.

[musD]

Not gonna lie, when I'm doing quick mental math I use this type of method. Like if you're adding two odd numbers (77+25) I'll think (75+25+2). Most times you don't use larger, odd numbers in daily life enough to facilitate just "knowing" every single addition problem at hand so breaking it down speeds the process along.

this, it also makes learning more complex problems easier because you can break things down and learn concepts vs facts. Lots of people are unable to understand math unless someone spends hours with them breaking down problems

[Brah0fPeace69]

So instead of teaching them 9+6=15, she's teaching them

1+5=6
9+10=10
10+5=15

none of which, to me, look like 9+6=15

You should watch the video again. Maybe you'll learn something the second time around

[StevieMe]

There are Chinese toddlers that would be shaking their heads in absolute disbelief at that video.

[unstrong]

There are Chinese toddlers that would be shaking their heads in absolute disbelief at that video.

Did you ever think that maybe Chinese toddlers learn math this way? That's how an abacus works.

God forbid the U.S. take methods that work and use them on our kids!

[pr0digy11]

But that lowers the amount of firing synapses in the brain meaning less cognitive development and poorer problem solving skills later in life.

brb graph both sides of the equation and the intersection is my answer

how i did everything

[PostMoves]

what the FUK. my jimmies havent been this rustled in nearly 2 years on the misc. srs.

[Knightmare01]

See, this is why I suck at math.

[unstrong]

Let me tell you guys a relevant math story. Carl Gauss is a famous mathematician, in fact one of the most influential mathematicians of all time. As a child, a teacher gave him a "timeout" assignment for poor behavior. The assignment was to figure out the sum of all numbers between 1 and 100. Gauss made this the shortest time out in the history of timeouts, because in 5 seconds he produced the correct answer of 5050. How did he find the answer so quick? He figured out that you can form a pair of numbers that adds together to equal 101 (1+100, 2+99, etc.), and there are 50 pairs of numbers between 1 and 100. So, 50x101 = 5050, and Gauss had his answer. Had you given the rest of the class that assignment with the methods they knew, they would have been there for hours adding up all those numbers long-form.

The point is, why not teach every child the conceptual skills to be Gauss, why the concepts are important, and how to generalize them? The child would then be free to use his mind on so many other things, speeding his learning. Then, when the child has to add the numbers from 11 to 20, he already knows how to do it ((11+20)*5 = 155). What is the point of having the child manually add up those numbers? Is that an efficient use of anyone's time? Why even get them into that mindset when it is of such limited applicability? If you arm kids with building block concepts early on, more difficult applications become much simpler. It is like saving for retirement--your life is a little worse up front, but a lot better later on.

[guest89]

Not gonna lie, when I'm doing quick mental math I use this type of method. Like if you're adding two odd numbers (77+25) I'll think (75+25+2). Most times you don't use larger, odd numbers in daily life enough to facilitate just "knowing" every single addition problem at hand so breaking it down speeds the process along.

Same here. I agree with her process... I just do it mentally. It's just as fast as any other method.

When I see it my mental process is:
9+6=
10+5=15.


I don't think about the rest

[Neil4123]

This is actually better than just having kids memorize that 9+6=15. It also provides a solid foundation for moving into multiplication in which 15x12 can be calculated by doing
15x10 = 150
15x2 = 30
150 + 30 = 180
They're just trying new ways for kids to learn math...not the end all be all fellas.

Everyone who's able to do semi-complex math in their head uses this technique but for something simple involving small numbers it seems like a complete waste of time to me. I was always good at math, and hated showing my work because I viewed it as a waste of time, using the technique you just described to solve problems more easily than doing long division for things like 15 x 12. Math teachers will cringe when I say this, but getting the right answer is all that matters.

[unstrong]

16253+52907

I'd rather do 5 simple additions than having to break this into a giant tree of sub-problems

If I were doing this problem, I would do:
16253+52907
= 16260+52900
= 16160 + 53000

This problem is trivial to solve. It's done in 4 steps, none of which require me to memorize carries or anything similar. IMO thinking like this better prepares for algebra as well, because you're simplifying down equivalences. It's exactly how it works. Why not teach a child to do this and solve problems simply?

[madguna]

this method is ****ing stupid
the point of ****ing learning math is to learn the ****ing fundamentals. all this half way bull**** to save time is ****ing pointless.
we have ****ing calculators for a ****ing reason. this type of **** is for all the ****ing retards that say "ill never use math in real life why am i learning it"
god i hate this stupid ****ing earth

[incomingbrOMS]

I'd like to point out that many (if not most) teachers find Common Core to be total BS. But they have to teach kids that way so they will pass standardized tests.

[Dan_S]

I always broke sums down and simply added everything together.
For me in the case of (77+25) I would (80+22).......by simply rounding it up to 80, adding the latter would be quicker.

That seems like a strange way to do it to me, but I think it's all pretty similar.

For your example, I would just add 77 and 20 to get 97, then pick that 5 back up for 102. In your method you're doing extra work by manipulating two of the variables, and that seems like a good method to screw up something later. But if it works for you, go for it.

[unstrong]

this method is ****ing stupid
the point of ****ing learning math is to learn the ****ing fundamentals. all this half way bull**** to save time is ****ing pointless.
we have ****ing calculators for a ****ing reason. this type of **** is for all the ****ing retards that say "ill never use math in real life why am i learning it"
god i hate this stupid ****ing earth

What fundamentals does memorization teach you exactly?