5th grade common core math problem!

• redstreak one

  

  Show how to solve the problem 378x6 using place value with regrouping. Explain how you knew when to regroup.
  
  this was on my sons homework! What do you guys think?
• GOONx19

  

  I don't know what regrouping means.
• salto

  

  378 x 6 as (300 x 6) + (70 x 6) + (8 x 6) = 1800 + 420 + 48 = 2268
• TedSheckler

  

  Common Core is the worst.
• GOONx19

  

  salto;1656581 wrote:378 x 6 as (300 x 6) + (70 x 6) + (8 x 6) = 1800 + 420 + 48 = 2268

  That's what I do when I multiply in my head. I didn't know it had a name.
• Ironman92

  

  GOONx19;1656590 wrote:That's what I do when I multiply in my head. I didn't know it had a name.

  I do 400x6 and then minus 6x22 from it
• Rotinaj

  

  Ironman92;1656598 wrote:I do 400x6 and then minus 6x22 from it

  Do you minus from it or subtract it? Plz be honest.
• Ironman92

  

  Rotinaj;1656628 wrote:Do you minus from it or subtract it? Plz be honest.

  I minus....subtracting confuses me
• Sonofanump

  TedSheckler;1656586 wrote:Common Core is the worst.

  Fact.
• WebFire

  GOONx19;1656590 wrote:That's what I do when I multiply in my head. I didn't know it had a name.

  Bingo. I don't why this is so hard for some people to understand.
• -Society-

  

  WebFire;1656708 wrote:Bingo. I don't why this is so hard for some people to understand.

  I would have to imagine that it gets more complicated than the example above, from what I have seen online.
• Classyposter58

  

  Eh it's trying to provide a way to teach critical thinking to kids because the amount of state testing currently going on has gotten so ridiculous that it seems all teaching is about covering as much as possible opposed to going in depth on certain things. One thing I'm certainly not going to do is follow this, once I get my job it's gonna be all depth cause it's fucking history
• SportsAndLady

  

  Classyposter58;1656723 wrote:Eh it's trying to provide a way to teach critical thinking to kids because the amount of state testing currently going on has gotten so ridiculous that it seems all teaching is about covering as much as possible opposed to going in depth on certain things. One thing I'm certainly not going to do is follow this, once I get my job it's gonna be all depth cause it's fucking history

  Are you drunk? Or just retarded?
• Ironman92

  

  SportsAndLady;1656725 wrote:Are you drunk? Or just retarded?

  retarj
• WebFire

  -Society-;1656711 wrote:I would have to imagine that it gets more complicated than the example above, from what I have seen online.

  Everything in school gets more complicated.
• QuakerOats

  GOONx19;1656577 wrote:I don't know what regrouping means.

  
  
  Being down 3 touchdowns at halftime, getting a pep talk / making adjustments / playing together / executing, and then winning by a field goal.
• QuakerOats

  And then there is the history class CC brainwashing brought to you by the pacifist progressives.
  
  http://www.independentsentinel.com/common-core-hate-world-war-ii-america-hate-what-america-represents/
• redstreak one

  

  My problem is with the wording, last week he was doing expanded form, so 817 is 800+10+7. So in this problem no mention of the word expanded form, just place value with regrouping.
  
  Many of you are saying you multiply that way already, when did you learn to do it? I didn't learn to do it until I understood the long way of multiplying each number and carrying. My dad taught Algebra for 25 years, and he always said, "learn to do it the long way then think of short cuts."
• 1_beast

  

  threeve
• arnie palmer

  

  I was not a fan of this Common Core math method either until I saw results with my daughter. She is in 3rd grade this year and had trouble with Math last year (took her long time to do addition or subtraction). Now they are focusing on this regrouping for adding large numbers and the teacher said she is at top of her class in speed of doing these problems correctly. Wife and I looked at each other and said weird for us, but working for her so great.
• WebFire

  redstreak one;1656843 wrote:My problem is with the wording, last week he was doing expanded form, so 817 is 800+10+7. So in this problem no mention of the word expanded form, just place value with regrouping.
  
  Many of you are saying you multiply that way already, when did you learn to do it? I didn't learn to do it until I understood the long way of multiplying each number and carrying. My dad taught Algebra for 25 years, and he always said, "learn to do it the long way then think of short cuts."

  I agree the long way should be taught first. But there are many that just go apeshit over the new math and want it eliminated because they don't understand and that's not how they did it.
• CenterBHSFan

  

  How many k-12 teachers were involved in creating Common Core? Google searches are all telling me that there weren't any involved in that process.
• Old Rider

  

  I taught both the long way (the way I was taught) and shortcuts to my 3rd grade class. Some kids chose one over the other. All I cared about was the final answer and showing me how they got their.
• salto

  

  Its disturbing this thread made it to #24 posts and that some of you are fathers.
• fan_from_texas

  redstreak one;1656843 wrote:My problem is with the wording, last week he was doing expanded form, so 817 is 800+10+7. So in this problem no mention of the word expanded form, just place value with regrouping.
  
  Many of you are saying you multiply that way already, when did you learn to do it? I didn't learn to do it until I understood the long way of multiplying each number and carrying. My dad taught Algebra for 25 years, and he always said, "learn to do it the long way then think of short cuts."

  That's how I do math in my head, but I don't think anyone ever specifically taught me. It's a quick and dirty way to get an order of magnitude estimate on things, which is much more useful in real life than the alternative.