Common Core Subtraction
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I am not sure how this is better way. If someone claims this is helpful in real World calculations, I do not get how. I mean how can it be easy to subtract using 10 steps instead of traditional? If they are really after an alternate way, why not Vedic Maths[^]? I did a beginner course in middle school on it and did find it weird at first. But once I became habitual, it was quick. As far as this method is concerned, this[^] is what I found.
My CP workspace: Incredibly trivial and probably useless code samples[^]
I homeschool my kids. My son is waaaaay ahead of grade level in math. But I don't think he enjoys it and everything is quite tedious. I would like some additional ways of approaching problem solving. I think this may be a nice fit. Thanks for the link to vedic.
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????? No wonder kids can't count back change. They're purposely trained to be morons. My theory is that this is done to distract people from realizing that the teachers are illiterate and incapable of working simple arithmetic. If anybody seriously evaluated their skills, they'd be immediately fired, and we can't afford to retrain all of them to flip burgers.
Will Rogers never met me.
*cough*innumerate*cough*
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason? Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful? --Zachris Topelius Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies. -- Sarah Hoyt
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Quote:
Of course, you could make it even easier by only incrementing the lower number by 1 until you reached the larger number
You can borrow my fingers if you need to. :)
There are only 10 types of people in the world, those who understand binary and those who don't.
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Quote:
You can borrow my fingers if you need to
No thanks; I hate to think where they might have been!
- I would love to change the world, but they won’t give me the source code.
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I'm flattered to be in your dreams but really, this has got to stop. :)
There are only 10 types of people in the world, those who understand binary and those who don't.
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*cough*innumerate*cough*
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason? Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful? --Zachris Topelius Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies. -- Sarah Hoyt
I was quite specific, and accurate. They can't write, either, though the OP didn't mention that fact. The two skills go hand in hand, and those lacking either are doomed to failure.
Will Rogers never met me.
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Now I don't mean to defend this nonsense. Understanding how to subtract properly is clearly important and the 'count up in increments' method is generally longer and therefore more error prone. However, this is how people often count out change ("that's £6.52, sir" ... *hands over tenner* ... "and your change ... six fifty two, six sixty, seven, eight, ten" as he hands me the 8p, a 10p, two 20s, two £1s and a £2) and it may be a good way in for people who aren't getting it, or want a way to confirm their 'proper' subtraction is working correctly.
BobJanova wrote:
"that's £6.52, sir" ... *hands over tenner* ... "and your change ... six fifty two, six sixty, seven, eight, ten" as he hands me the 8p, a 10p, two 20s, two £1s and a £2
So you score £1.20? I can see the value in this method. ;P
What is this talk of release? I do not release software. My software escapes leaving a bloody trail of designers and quality assurance people in its wake.
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Edumaciated?
You'll never get very far if all you do is follow instructions.
Ahh... I always miss the "I" in the middle... must be silent.
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BobJanova wrote:
"that's £6.52, sir" ... *hands over tenner* ... "and your change ... six fifty two, six sixty, seven, eight, ten" as he hands me the 8p, a 10p, two 20s, two £1s and a £2
So you score £1.20? I can see the value in this method. ;P
What is this talk of release? I do not release software. My software escapes leaving a bloody trail of designers and quality assurance people in its wake.
No, he only scores £1.10. £0.08 + £0.10 + £0.20 + £0.20 + £1.0 + £1.0 + £2.0 = £4.58
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No, he only scores £1.10. £0.08 + £0.10 + £0.20 + £0.20 + £1.0 + £1.0 + £2.0 = £4.58
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Now I don't mean to defend this nonsense. Understanding how to subtract properly is clearly important and the 'count up in increments' method is generally longer and therefore more error prone. However, this is how people often count out change ("that's £6.52, sir" ... *hands over tenner* ... "and your change ... six fifty two, six sixty, seven, eight, ten" as he hands me the 8p, a 10p, two 20s, two £1s and a £2) and it may be a good way in for people who aren't getting it, or want a way to confirm their 'proper' subtraction is working correctly.
I haven't had anyone count out change since the mid 80's.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013 -
I haven't had anyone count out change since the mid 80's.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013 -
BobJanova wrote:
"that's £6.52, sir" ... *hands over tenner* ... "and your change ... six fifty two, six sixty, seven, eight, ten" as he hands me the 8p, a 10p, two 20s, two £1s and a £2
So you score £1.20? I can see the value in this method. ;P
What is this talk of release? I do not release software. My software escapes leaving a bloody trail of designers and quality assurance people in its wake.
