No. I don't. What happens when the number is not simplistic? Like 8? 7 and 1, 6 and 2, 4 and 4? Or 6? 6 and 1, 3 and 3, 2 and 4, 5 and 1. I am not even sure why the fuck your original question even used 7 and 2. Why not 8 and 1? How is that easier than borrowing from the other column? Christ. Why, after a millenium do we suddenly need a new way to do subtraction and addition?? SOMEONE EXPLAIN THIS TO ME. Someone make a valid argument because these new processes make it look like some bureaucrat cunt sucker making himself look useful instead of effective. That's bullshit too. That example is as simple as it gets. Show me why the new method is easier than the old method with 2765 - 1897. Not this one single value difference. That is a cop out and a fucking retarded retort. Fuck that guy too. He can take his teaching degree, roll it up, wedge it in his peehole. Edit: my ideal math curriculum looks like the one I got in in the 80s before dinguses started fucking with it.
I was always terrible at math growing up, and when I say terrible I mean a C student. In a way, I was the student these new methods target, an OK but not great student with potential. My intellect is fine, but math is all about rules and my horrible short term memory doesn't like that. I remember in third grade my twin was placed in the accelerated math class and I was down with the normies and morons. This wasn't because I am dumber, its just my memory is worse. The same thing happened in 7th grade, both times I had to beg to be in the advanced classes with my brother, both time they gave in and I got my C, C+. I never quite sink in these classes, but getting a B would've been a God damned miracle. The new method makes sense, its basic algebra without the X. Apparently 3000-2999=x is the same as 2999+x=3000, who knew? Growing up I tried tutors and I tried Kumon and in college when I decided to do Econ I was on my ADD meds. The thing that helped me the most was taking it slow and working with it on my own. Kumon didn't work because it was rote memorization. My tutor in high school helped but I'm not sure how effective she was. This was partly due to the fact I thought she was hot and constantly hit on her, and another part of it was I was working on my memory again. I'd go there for an hour, do enough to get by forget it 5 mins later Teaching kids more arithmetic tricks makes sense to me. The more ways kids have to do something, the more likely they are to find something that works for them. If it doesn't work for someone else, fuck it who cares, thats why you provide multiple options so that everyone can find one for them.
The new education stuff coming out is a money grab imo. It's all about filling someone's pocketbook. Kids will be tested by standardized tests no matter what, but constantly changing how things are taught is getting a bit ridiculous. Most of my coworkers don't believe that a lot of the changes are here for the long haul, but rather short term while certain politicians are in office pushing the reform. Personally, I don't have a clue what is going to happen in the near future, but I'll roll with the punches and put on the show when I'm observed and then teach how I want which is the traditional way.
Your serious math talk is making it hard for me to post this funny video. Bad dog! Okay fine, he's adorable. I have a hard time talking schools. But that's because we moved when our old school district adopted something called Standards Based Grading which basically teaches to the lowest common denominator. They didn't get grades. They got 1, 2, 3, or 4. Which a lot of elementary school uses but our high school adopted it. For example, 3 = Proficient. The range for Proficient? 70-100%. So the kid acing everything got the same grade as the kid that wasn't. How do you get a 4 (Above Proficient)? You have to apply what you learned to something you haven't been taught yet. Yeah, good luck. We moved and 4 years later the School Board voted to do away with it after seeing how the kids were struggling at college. Oh yeah, try getting grades transferred from a 3 to a school district that uses traditional scoring. My daughter had a 98% in one of her classes. Grade on her report card? 3. After her first math test she said to me "I got a real grade." Kids were frustrated, teachers were frustrated. Waste of taxpayers' money. This is basically what the teachers did. They also were reprimanded if they spoke out against the new format. The Superintendent that was the leader of this new program retired when the board voted to scrap the program. I think the parents celebrated when that happened. Oh yeah, kids weren't required to do homework. However, this might have affected their "citizenship" grade. What's a citizenship grade? Exactly.
I was never formally taught to add or subtract like that, but I do it anyway in my brain if I need to subtract larger numbers. It is easier for me to rationalize distances along a number line than mentally carrying columns of numbers. I can see this as a way to better handle mental arithmetic but it is something I assumed most people did without being taught. Or maybe I am exceptionally bad at math and play mental games with myself to get to the right answer.
Dammit toddamus. One second earlier and I would quoted your post and there'd be no deleting it. I had a funny comment about it.
Like I said, I delete about half my posts on here. If you want to quote me you have to get it quick usually. Anyway, more dogs, boobs and sexy redheads. I swear, these are the only things I need in life to survive and be happy.
I was going to say at least you picked a (very very loosely defined) redhead this time. But when I quoted it the URL says sexy brunette, so I take it back. You want to fix it now, don't you? Too late.
Nope, I know I said redhead and posted a brunette. It was on purpose. I stand by what I said earlier.
Holy fuck, it took me forever to understand that 32 - 12= x shit. Yeah, I get it. Yeah, it's the right answer. But that's a lot of steps to get to it. I don't like that "subtraction by addition, then addition of the additions" thing. Not my style.
Sorry, it was late and I was assuming that y'all were reading my mind. You break up the number into parts with the intent of making the easier subtraction. You automatically know that if you subtract 7 from 37 you will get 30, so you take care of that in your head immediately. Then you are left with 2, so you subtract that and it is 28. If the number had been 8, same thing. 37 - 7 is the easiest part of it, and then you have 1 left, so it is 29. It is actually a method I had begun adopting in like the last decade when out and about and have to add or subtract numbers in my head. LIke if I have something that costs 8.29 and need to add something that costs 75 cents to it. I automatically in my head add 8.25 to .75 to get $9. Then I take the 4 cents left over and add that and get 9.04. It is quicker to do that in my head than to do 9 + 5 is 14, carry the one and do 1+2+7= 10, carry the 1, 8+1=9. That's 3 calculations, whereas the other way I only did 2. I apologize if that also does not make sense, this is why I never even remotely considered homeschooling.
2 + 2 = potato But, that "method" you're describing is basic, intuitive shortcut. Of course it's easier to subtract something like 7 from 37. I thought everybody that can do basic math in their head used those sorts of shortcuts. And, I get that some people don't have that sort of thought process. I use math every day, do calculations in my head, and have all sorts of shortcuts like that - none of which I was taught in a classroom. I still don't understand that 32-12 example, where the 12+3 comes from, and why that would be taught. But, I am pretty dumb.
Re: 2 + 2 = potato With the 32-12 example they are just finding the difference between the two by adding up from 12 to 32 by getting to the next 5 or 10 number. Someone mentioned making change when at a cash register, which is the way a manager taught me when I worked at a diner. So in the 32-12 example, you start at twelve: 12+3 gets you to 15 15+5 gets you to 20 20+10 gets you to 30 30+2 gets you to 32. Really just a different way to look at the same problem.
Re: 2 + 2 = potato I agree it is intuitive because I eventually figured out on my own that doing it that way is easier. But it took me a long time because my first inclination was to always do it the way I was taught - people have a hard time letting go of what they are taught. A very common example is the 20% tip at restaurants. So many people I know think they have to do the "multiply 37.48 by 0.20 and show your work" in their head, and decide to just use their calculator because they think it is quicker. They haven't realized that in the time it takes to pull out the calculator, you could have already rounded up to the nearest dollar, multiply by 2 and move the decimal over (and then round up again if you are so inclined). Even with the multiplying of 38 by 2 - I used to have a harder time with that until I started thinking of it as broken out into 30+30 and 8+8, then 60+16=76. This was years in the making because teaching trumped intuition for so long. Even my husband, who is crazy good at complex math, hadn't figured that out on his own until we were at a restaurant one time and I explained it to him. I'm not saying the way I was taught was wrong - and it is certainly great for complex problems. But the way my daughter is taught is a mix of both and I think that will serve her better in the long run than learning it just the one way.
I find it superlatively hilarious that people are discussing math on St. Patrick's Day. We're either dorks or... well, dorks. EXCELSIOR! I'm off to buy Guinness. Observe me for symptoms later.
Re: 2 + 2 = potato Here's how I figure a tip on 37.48. 4 x 2 = 8. Therefore, $8 tip. That seems the easiest way of them all. If I didn't do it that way, I think 38 x 2 is easier than the multi-step thought processes of the 30 + 30, etc. When my kids were younger they were taught several ways with the intent being they could use whatever works for them. Most picked the traditional way, but there were some outliers that used the other ways as they just computed stuff differently. So, this video is a little long (4 min) but it involves a crazy Canadian and since we have some of those here as well as people that like to make fun of Canadians, some of you might appreciate it. Apparently there's this challenge where you um, challenge someone on video and they have to go dunk themselves in a lake within 24 hours of the challenge. When they do it, they then challenge someone else to do it. He's standing outside in cutoff jeans (sexy), you can see his breath, and he's not even shivering! What is it with you guys? Sounds like it's even freezing rain! I will say he's dedicated. His body's not bad either. Oh yeah and he's a ginger, so it's keeping with the theme as you can also see his boobs!
Re: 2 + 2 = potato That's assuming you automatically remember that 38 x 2 = 76, right? I don't automatically remember that. So I can either do the 30 + 30 thing or I can do it the traditional way in my head, which for me would take longer.