Addition regrouping-ah! - ProTeacher Community




Home Join Now Search My Favorites
Help


      Second Grade

Addition regrouping-ah!

>

Reply
 
Thread Tools
reesespieces's Avatar
reesespieces reesespieces is offline
 
Joined: Dec 2008
Posts: 3,185
Blog Entries: 2
Senior Member

reesespieces
 
reesespieces's Avatar
 
Joined: Dec 2008
Posts: 3,185
Senior Member
Addition regrouping-ah!
Old 11-19-2013, 09:55 AM
 
Clip to ScrapBook #1

This is such a tough topic for second graders!! Anyone have any tips when students are first learning how to do this??

We used base ten blocks and paper today for our second lesson in the unit (pearson envision topic 8) and I had a lot of "I don't understand this" comments.

We watched a brain pop video and I modeled a LOT...but there were still a few who didn't follow.


reesespieces is offline   Reply With Quote

sharon77's Avatar
sharon77 sharon77 is offline
 
Joined: Mar 2007
Posts: 682
Senior Member

sharon77
 
sharon77's Avatar
 
Joined: Mar 2007
Posts: 682
Senior Member
2-digit adding
Old 11-19-2013, 11:00 AM
 
Clip to ScrapBook #2

I use this rhyme for when the add the ones column: If it's 10 or more put 1 next door.
I also showed my students this video:
http://www.youtube.com/watch?v=QAL8XxyGVow
sharon77 is offline   Reply With Quote
teacherpippi's Avatar
teacherpippi teacherpippi is offline
 
Joined: Aug 2008
Posts: 4,766
Senior Member

teacherpippi
 
teacherpippi's Avatar
 
Joined: Aug 2008
Posts: 4,766
Senior Member

Old 11-19-2013, 03:30 PM
 
Clip to ScrapBook #3

Repetition in many different ways has always helped my students. I'll present 2-3 problems the whole class period and I break students into groups to attempt the problem with any manipulatives and paper then need (I usually give them a half- or quarter-sheet of chart paper and they're in seventh heaven).

When we come back together, students practice showing how they did a problem and explaining why they did what they did. Once we gather many ways, we discuss any misconceptions. If there are strategies that weren't used, I model those as a whole group.

Usually they understand one of the strategies and I use that to help them understand the others, specifically the traditional algorithm. It can be the quickest, but until they understand the reasoning behind it, it's really hard for them to do it.

Below is an anchor chart I created with my class last year.
Attachment

Sign in to view attachment. Not a member? Sign Up FREE
teacherpippi is offline   Reply With Quote
DrivingPigeon's Avatar
DrivingPigeon DrivingPigeon is offline
 
Joined: Aug 2010
Posts: 749
Senior Member

DrivingPigeon
 
DrivingPigeon's Avatar
 
Joined: Aug 2010
Posts: 749
Senior Member

Old 11-20-2013, 01:44 PM
 
Clip to ScrapBook #4

For most of my students it took a lot of repetition.

We use Math Expressions, which introduces them to a few different strategies. I used base-10 blocks, and then switched to drawing a picture. Most students were successful with both strategies. I then moved onto the traditional algorithm. This is when it all clicked for most students. It took them about 4 weeks to get it. :/
DrivingPigeon is offline   Reply With Quote
Keltikmom's Avatar
Keltikmom Keltikmom is offline
 
Joined: Mar 2013
Posts: 10,808
Senior Member

Keltikmom
 
Keltikmom's Avatar
 
Joined: Mar 2013
Posts: 10,808
Senior Member
Regrouping
Old 11-20-2013, 06:13 PM
 
Clip to ScrapBook #5

Isn't Envision fun?. I used the base ten blocks for two days before even giving them the work sheets.

It's the subtraction that is brutal for a few. To piggy back on PP's poem, for subtraction we say "If there's more on the floor, go next door." Again, lots of manipulative use. I was surprised that after two weeks of this, two kids were still mystified. Discovered one of them has very weak number sense. The other just need LOTS of practice.


Keltikmom is offline   Reply With Quote
tigmil's Avatar
tigmil tigmil is offline
 
Joined: Jun 2006
Posts: 656
Senior Member

tigmil
 
tigmil's Avatar
 
Joined: Jun 2006
Posts: 656
Senior Member
Just Curious
Old 11-23-2013, 09:43 PM
 
Clip to ScrapBook #6

Are you using Common Core standards?

The traditional algorithm isn't supposed to be taught until fourth grade. Instead, 2nd graders should be adding/subtracting using strategies based on place value, properties of operation, and the relationship between addition and subtraction. One of the previous posters had several of those strategies on an anchor chart.
tigmil is offline   Reply With Quote
Iteachsince11 Iteachsince11 is offline
 
Joined: Sep 2011
Posts: 14
New Member

Iteachsince11
 
Joined: Sep 2011
Posts: 14
New Member
I agree with Tigmil
Old 11-24-2013, 04:09 PM
 
Clip to ScrapBook #7

My district is in the first year of Common Core for 2nd grade, and they are correct, CCSS has the standard algorithm being taught in 4th grade (even our state had it as a 3rd grade standard prior to adopting Common Core). I don't teach that method, and I try to discourage parents from teaching it, because it can throw the students off. I instead really focus on place value and number sense.

The anchor chart someone else had posted was a really good example of ways to use number sense to add 2 (and 3) digit numbers using things beyond the standard algorithm. At this point in the year, I'm just teaching/modeling drawing base tens blocks, breaking numbers into tens and ones, using 100s charts, and breaking numbers into other groups/landmark numbers that they do know. I only have a few students that are starting to make that jump (almost every single student still wants to draw 25 circles and 39 more circles when adding 25+39, but we use that as a starting point and jump from there), but a few is more than I had at the beginning of the year, and I know that it typically takes my class almost the whole year to use other strategies, to the point that the only students I typically see using circles/tallies or counting by 1's the whole way are my lowest students.

It's just a thought. If you aren't using Common Core, then this post doesn't really apply to you, but if you are then I wouldn't really be stressing the standard algorithm.
Iteachsince11 is offline   Reply With Quote
FabuMom FabuMom is offline
 
Joined: Nov 2011
Posts: 458
Senior Member

FabuMom
 
Joined: Nov 2011
Posts: 458
Senior Member
Post it notes
Old 11-24-2013, 05:14 PM
 
Clip to ScrapBook #8

When I taught this skill to my mostly kindergarten level second graders this year, I used post it notes to model the "carry the tens". I would add the ones and hold up post- it notes with the answer. (Ex. 4+9=13). I would put the post its with 1 and 3 under the 4 and 9 and show that there isn't room for both in the ones places. Then I would move the 1 into the tens column and add it. It made a huge difference!
I hope this makes sense!
FabuMom is offline   Reply With Quote
kspotter kspotter is offline
 
Joined: Jul 2006
Posts: 214
Full Member

kspotter
 
Joined: Jul 2006
Posts: 214
Full Member
Regrouping
Old 12-11-2013, 03:48 PM
 
Clip to ScrapBook #9

I used this website on my SmartBoard

http://nlvm.usu.edu/en/nav/category_g_2_t_1.html

It is an interactive site that models what is happening in addition and subtraction when regrouping.

I haven't had any trouble teaching addition regrouping as long as I did adequate place value preparation beforehand.

Subtraction regrouping is harder but most kids got it after watching me manipulate the base ten rods on the above site. I also use the poem

Is there more on the floor? Then go next door and borrow ten more.
Is there more on the top? Then stop, subtract.
Are the numbers the same? Then zero's the game.
kspotter is offline   Reply With Quote
gohokies's Avatar
gohokies gohokies is offline
 
Joined: Oct 2008
Posts: 172
Blog Entries: 1
Full Member

gohokies
 
gohokies's Avatar
 
Joined: Oct 2008
Posts: 172
Full Member
regrouping
Old 12-17-2013, 06:42 PM
 
Clip to ScrapBook #10

I get that every year too and you just have to keep doing it . Stay the course and pull small groups for those that dont get it. They will get it.


gohokies is offline   Reply With Quote
Mr. Big Mr. Big is offline
 
Joined: Apr 2012
Posts: 40
Junior Member

Mr. Big
 
Joined: Apr 2012
Posts: 40
Junior Member
Difficult
Old 12-18-2013, 01:21 PM
 
Clip to ScrapBook #11

concept for 2nd graders. We just practice, practice, practice.
Mr. Big is offline   Reply With Quote
Whittlesey Whittlesey is offline
 
Joined: Jul 2009
Posts: 166
Full Member

Whittlesey
 
Joined: Jul 2009
Posts: 166
Full Member
Envision?
Old 01-07-2014, 04:40 AM
 
Clip to ScrapBook #12

Keltikmom,
What is it you don't like about Envision? Some of our teachers want to pilot it. I am interested in hearing some of the negative things about it.

Do you feel it goes well with the common core?
Is there enough for your students to master all of the standards in the core?
Do you have to supplement?
Are your students being successful?

Sorry about all the questions,

Thanks!
Whittlesey is offline   Reply With Quote
elizwolfson elizwolfson is offline
 
Joined: Aug 2008
Posts: 10
New Member

elizwolfson
 
Joined: Aug 2008
Posts: 10
New Member
practice, practice, practice
Old 01-28-2014, 05:48 PM
 
Clip to ScrapBook #13

I agree with the others, it takes them a week or two to get the hang of it. We are teaching the "break apart" method, but we began by using and then drawing base 10 blocks. I start with 2-digit plus 1-digit, such as 47 +6. Then I have them draw 47 (tens and ones), add the 6 ones, and circle 10 ones to count as a ten. My middle and advanced students have now pretty much got the hang of breaking the numbers apart without drawing, and my lowest few are still at the drawing stage.
elizwolfson is offline   Reply With Quote

Join the conversation! Post as a guest or become a member today. New members welcome!

Reply

 

>
Second Grade
Thread Tools




Sign Up Now

Sign Up FREE | ProTeacher Help | BusyBoard

All times are GMT -8. The time now is 12:52 AM.

Copyright © 2019 ProTeacher®
For individual use only. Do not copy, reproduce or transmit.
source: www.proteacher.net