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  #1  
Old 12-03-2011, 07:13 PM
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karebear76 karebear76 is offline
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How do *YOU* teach subtraction with renaming?

I spent several class periods teaching this skill. We used base ten blocks to discover it, I've used all the things I can think of, and now as I grade a few errant papers, I notice that they still don't get it.

I thought most had it, so I moved on to a new concept. Now I see that many more don't have it than do. I'm looking for any and all ideas!

BTW, this is a 4th grade spec ed class, so the more concrete & visual, the better. I'm teaching the same material as the regular math teacher, but spending much more time on each concept.
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  #2  
Old 12-04-2011, 02:36 PM
waterfall waterfall is offline
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By "renaming" do you mean regrouping/borrowing? I've never heard that term before...I want to check that we're talking about the same thing before I answer!
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  #3  
Old 12-04-2011, 04:04 PM
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ciounoi ciounoi is offline
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In student teaching, I used base ten blocks, games, place value order sheets, and whiteboards. I introduced the concept in very, very small increments, like so:

1. Made sure students knew how to use the blocks (some were still shaky)
2. Showed how a ten block could be exchanged for ten one blocks (took a few days)
3. Played a few games to reinforce (mostly just exchanging the blocks for numbers written on my whiteboard)
4. Showed how ten one blocks could be exchanged for one ten block (didn't take much time at all)
5. Played games where they had to make a certain number with the blocks and take a certain number away... basically subtraction w/ regrouping but I walked them through it
6. Introduced the number figures... wrote a lot of things like 23 - 9 = ? on my whiteboard. Kids had to use the blocks to make the numbers and subtract.
7. Did 28349023 practice problems/games to reinforce.
8. Told the kids we were going to try doing the subtraction problems without the blocks, just using the whiteboards and our brains. Some of them got it immediately, some needed lots of reteaching and practice.

I did this until they got it... it took us about 4-5 weeks for almost all of the kids to master. Apparently several of the kids had still not mastered it at the end of the year (I did my unit in the fall)... I guess it just comes with the special ed territory!! :P

Hope this helps!
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  #4  
Old 12-04-2011, 05:21 PM
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karebear76 karebear76 is offline
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Yes, waterfall, I am referring to regrouping/borrowing. My math methods professor called it renaming as you are renaming tens as ones, hundreds as tens, etc.

Thanks for the tips so far. I'm trying to come up with some new lessons for this...
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  #5  
Old 12-04-2011, 05:27 PM
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Aliceacc Aliceacc is offline
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Could you tie it into money? Rename $1 as 10 dimes?? Start the problems with giving change in multiples of 10 cents?
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  #6  
Old 12-04-2011, 05:33 PM
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WaterfallLady WaterfallLady is offline
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Sometimes my students get more confused if I use manipulatives to teach them, or let them use it. Sometimes, I just have to withdraw the concrete manipulatives and show them how to do it. I make a checklist of the steps. They might not get the concept, but if your state requires kids to do it for the test, they can at least do it.
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  #7  
Old 12-04-2011, 05:33 PM
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teacherintexas teacherintexas is offline
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Have you had the kids draw out the problems in base ten blocks before going to the abstract? When I taught second, several kids had to use that method for much of the year.
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  #8  
Old 12-04-2011, 06:53 PM
waterfall waterfall is offline
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Quote:
Originally Posted by WaterfallLady View Post
Sometimes my students get more confused if I use manipulatives to teach them, or let them use it. Sometimes, I just have to withdraw the concrete manipulatives and show them how to do it. I make a checklist of the steps. They might not get the concept, but if your state requires kids to do it for the test, they can at least do it.
I admit I do this too. The 10's/1's is too abstract. I have a checklist of things they follow as well for multiple digit problems...

1. First check to see if I'm adding/subtracting (most of my kids circle the sign to help them remember)

Once they see they're subtracting...
I always start on this side (farthest from the subtraction sign)
Can I take __(bottom number) things away from ____(top number) things? If you're not sure, get out your fingers. So, "yes, I can take 6 things away from 10. So I keep going" or "no, if I try to take 8 things away from 6 things, I run out. I have to borrow from the other side."

Add your one, and take one away from the other side. Solve. It sounds weird typed out, but it makes sense when you say it when you're looking at the problem, lol.

I've never had a kid not be able to do it after several lessons. They tend to need practice (even when we're doing other concepts, I'll throw a couple of these in at least once every few weeks), but it's not something I really have to spend weeks and weeks on or something.
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  #9  
Old 12-04-2011, 07:26 PM
Jayneorama Jayneorama is offline
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Upper Elementary Teacher
Is place value an issue for these kids? For students that have had a hard time with regrouping, I've gone back to basic place value and reviewed/gamed a lot there. Then, when I re-taught the borrowing/regrouping lesson, it went much more smoothly.

I also, aside from all of the manipulative/pictoral teaching, do teach a straight up algorithm - I use a modified Knockin' On Heaven's Door, "Knock, knock, knockin' on my neighbor's door, to borrow 10," to remind them of procedure and make it fun. There are some kids, in my experience, who get the concept but not the procedure until they are explicitly taught the algorithm.

I have no idea what would or would not apply to SPED in this case, so your mileage may vary here.
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  #10  
Old 12-04-2011, 07:34 PM
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karebear76 karebear76 is offline
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Thanks for all the suggestions! Lots of good ideas here.

We spent about a month at the beginning of the year with place value, and most have a basic to good understanding of it. We've been going over some of the most difficult things IMO to teach all in the name of a test: place value to hundred millions, rounding to nearest million, subtraction with renaming, and estimating sums and differences (through millions)...

I have at least 5 different ability levels at the same time.

I really don't like teaching math much this year
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