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Subtraction with Regrouping

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Teaching subtraction with regrouping can often be a difficult and frustrating concept. Here's a collection of tips, activities, and strategies to help your students learn this concept.
regrouping
Posted by:bg #26663

I teach 2nd grade and my students also struggle with this new concept. What I have found to be successful is to tell them about "houses" and have them draw three houses in a row. We have the ones house, the tens house and the hundreds house, etc. Throughout the lesson, I refer to our "houses." I have to remind them that we always begin any math problems with the "ones" house.
The next way I help them visualize what we are doing is to think of the bottom number as the people, and the top number as the apples in a tree. This way they will be reminded to start at the bottom and look up to see the apples for correct subtraction. If there are not enough apples in the tree, they must go next door to the tens house and take one...

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Use connecting cubes!
Posted by:hngsmom #110752

Does your cooperating teacher have any connecting cubes (multi-link cubes) to use as a manipulative? Its a great way to show kids what the whole regrouping thing means. For example, build 90 (9 groups of ten) and then take away 42. The students will have to "break a ten" to get the 2 ones that they need to remove. Having a concrete example has really helped my students see the whole regrouping process. I also teach them to remember BBBB--bigger bottom (number), better borrow (from the tens). Its so hard to put this into words--if you could come to my classroom, it would be so much simpler! Good Luck!

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Regrouping in subtraction
Posted by:rth #33963

I use a similar story to Jen's about going to your neighbor's who lives in the tens column.

We also learn this poem -

SUBTRACTION RHYME

More on top?
No need to stop!

More on the floor?
Go next door.
Get one ten.
That's ten ones more.

Numbers the same?
Zero's the game!


When we talk about whether we need to regroup or not, we refer to the poem. I also have them circle the larger number in the ones place, if they seem to have trouble knowing whether to regroup or not.


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math
Posted by:sonya #33917

This is in resoponse to the student teacher looking for a fun way to teach subtraction and regrouping. In my classroom, I used twizlers as a ten model and mini marshmellows for the ones and demonstrated regrouping using the treats! The children loved it! They also enjoyed eating their math manipulatives at the end of the lesson! I hope this idea helps!!!

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idea for regrouping
Posted by:jan #69014

For the problem : 43-19, How much is 3-9? IMMMMMMPOSSIBLE! (The kids love shouting this, so they stay alert for times they can use it!) Go next door and take a ten (mark out the 4 and write a 3 above it), leave 3 behind. Bring home 10 to go with 3 (mark out 3, write a 13 above it)to make 13. How much is 13-9? 4 (write 4). How much is 3-1? 2

The most common mistake in regrouping in subtraction for my students are that they try to subtract the minuend from the subtrahend when the minuend is smaller (in the ones place). Amazingly, being able to shout IMMMMMMMMMPOSSIBLE! seemed to get their attention and solved the problem for most of them! (Aren't kids weird?!?!?)

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regrouping
Posted by:bonnie #62472

One technique I have used is to have students play a game. This might be confusing so email me if I'm not clear and you are interested. I have students play a game called "In the land of ten" it's the opposite of the same game they play to "get" regrouping in addition. It's against the law of the land to have ten you must exchange.
I give the kids a mat you can make them quickly by drawing two vertical lines so have a ones, tens and hundrds column. (place value mats if you have them) Give them a green chip (bingo chip or piece of green 1 x 1 paper or a hundreds block whatever you have available. The students roll one die and need to remove that number. To remove a 6 they would need to first regroup to 10 tens and then exchange 10 ones for one of the blue chips. ( I use green for 100's...

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Subtraction
Posted by:Grace #21534

I usually start with a game. I have already played this game the opposite way for addition with regrouping.
To subtract, divide children into small groups. One is the banker. Each group has a die. I don't know what materials you use, but I use multibase tens and units to start. You could use toy money, dimes and pennies. Give each child 50 cents in dimes. The idea of the game is to be left with no money. The child throws the die. If they throw a 3 for example they can get rid of three pennies but to do this they have to exchange a dime at the bank. They then give 3 pennies to the banker. The child to get rid of all their money first is the winner. Near the end of the game it gets very exciting as they have to throw the correct number to get rid of their...

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subtraction
Posted by:Betsy #56045

I know that we don't teach regrouping as "borrowing" anymore, but I still teach my students a saying I heard from another teacher. "Bigger Bottom Better Borrow" Also, when crossing out in one column and regrouping to the next, my students had trouble remembering and understanding all the steps. So my students mark through the one and instead of crossing out the three and writing a 13 above it, write the one beside it to make the number thirteen.
13
- 6

I hope you can make sense of what I wrote. Nothing amazing just tried and true techniques. Just remember to be patient and be ready to reteach over and over until your students catch on. Good luck!

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Subtraction with Regrouping Activitiy Idea
Posted by:Brenda #74347

During student teaching, I cut strips of material, which almost any mom has on hand

I cut one color for hundreds, one for the tens, and a different color still for the ones - all of similar size.

I laid the strips in groupings across the floor, and did a hands-on activity. When I set up a problem, I showed how many strips were needed in each column. (Of course, I had to have plenty of strips on hand for each color to accommodate regrouping efforts.)

It was easier for some visual and tactile learners to see and experience, because they were able to associate color with columns, and the regrouping took place in front of their very eyes.

This is very similar, of course, to using cubes, but just a different twist.

Hope this...

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Using stories and elevators to subtract
Posted by:Louanne #21505

When I introduce subtracting with zeros, I turn it into a story. For example, with the problem 701 - 286: We begin by looking at 1-6; it can't be done. So the number 1 goes to his next door neighbor, the zero, and asks to borrow 1. But zero says, "I don't have any, but I'll check with my neighbor." Zero goes to her neighbor 7, who happily gives one to zero. 7 loses 1 and becomes 6. 0 adds one right in front, so she becomes 10. Then 1 can borrow from 0, who is now really 10. 10 becomes 9, and 1 becomes 11 after putting the borrowed 1 right in front.
Then we go to 9-8, which can be done; then 6-2, which also can be done without regrouping. So all the neighbors are happy!

It's kind of corny, but the students are able to visualize going next door and getting something, so it's another way to learn for those who are not "math smart."

The...

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regrouping
Posted by:second year teacher #20466

Last year when my third graders didn't understand the concept my husband suggested that I use Cheetoes (which represented 10) and soup crackers (which represented ones).

The first day we went over the pages in our book, then I passed out the food. I would ask students to show me thirty five or fourty two. After we did that for a couple of minutes I asked them to trade in a ten for ten ones...we did that for a few minutes then they would show me two numbers. We did this until we worked our way up to using the food to subtract and regroup.

It helped a great deal, but I did still have a few that "didn't get it" until later.

Hope this helped!


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Regrouping
Posted by:Kimberly #20500

When I teach this to my 2nd graders, I get them all around me where they can see. I don't use the board--this is special math (little do they know it's because it's so hard for them to grasp). I use a MagnaDoodle to write on. Taking them out of their element makes them really pay attention because they aren't sure what you're up to and they don't want to miss ANYTHING! I draw boxes around each column so we make sure we line up the tens and ones. We have the Ones family and the Tens family. The number at the top of each column is how many people live in that house. I even draw a tiny roof on top of each "house". The bottom number is how many people are leaving the house to go where ever. We physically hold the numbers up...

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sub w/ regrouping
Posted by:Dana #88898

Using MONEY, I believe, is the only way the students really comprehend regrouping. Using a pennies (ones) and dimes (tens) mat. 43-28:
They see there are only 3 pennies and can not take 8 away. They totally relate to 10 pennies being equal to 1 dime, so making this "trade" is within their realm of thinking. Now they see the 13 pennies and there are only 3 dimes left to take the two away. I taught second grade the past two years and ALL of them grasped this concept. We used the money for an entire week and VERY gradually moved to paper pencil. Good Luck!!

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Regrouping
Posted by:Sabrina #25241

I play a game with my students called "sticks and stones". They each have a game mat which is a sheet of paper divided into three columns. The columns are listed (ones, tens and hundreds). They play in groups of twos. Each group has a spinner, a good supply of unifix cubes or snap together cubes and their mat. One child spins the spinner and puts that many cubes in his ones column. On his next spin, if he has enough (10 cubes) to make a stick he will snap them together and put them in the tens column with the others left over in the ones column. The winner is the child with the largest number at the end. This has really helped my students understand the concept of regrouping to make a ten.

I also use the daily straw count with my...

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regrouping activities
Posted by:E #55593

I bought some receipt pads like those used in diners for a dinner ticket. Then I made a menu using 2 digit numbers. One side of the menu lists sandwiches and the other side lists beverage choices. I give students a total amount of money to spend and they write their own menu ticket and then add to find their total and subtract to find their change. My studetns always enjoy this activity.

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naming the houses
Posted by:elise #26970

I too use houses to help the children visualize regrouping. However, I name the houses OTTO ONES, TAMMY TENS, and HARRY HUNDREDS. They know if Otto does not have enough hotdogs to feed his friends he needs to go to the house next door (Tammy's) and borrow a pack of ten. This has really helped the children to understand the idea of borrowing.

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regrouping with fruit roll-ups
Posted by:Deanne #57025

I use boxes of fruit roll-ups (ten in a box)and some individual roll-ups to show that if you don't have enough singles(ones place), you have to open a box(tens place) and take ten out. They can then see why the ones place has increased by ten and seeing the number of full boxes tells them how many groups of ten are left.

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subtracting with regrouping
Posted by:jen #33962

I currently teach 2nd grade bilingual and after I explained and did these examples my kids totally got it!

Let's say you have 36
- 18
______

look in the one's column. you have 6 and I want 8. can you give me 8? NO, you only have six, so you walk over to your neighbor's house (3). BUT!! your neighbor only shops at Sams club and buys things in groups of ten. he will never give you only four or six! ONLY A GROUP OF TEN!!!! so you borrow 1 group of ten from your neighbor. so now you have 16 and your neighbor only has 2 groups of 10.
Make sure when you are telling them this to tell them that your neighbor does not like to share and will not give you more than 1 group of ten.
after my kids got the concept of "walking to your neighbors" then I added...

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Borrowing
Posted by:Kimberly #37681

We start off using dimes and pennies to subtract and borrow. My 2nd graders love the idea of Mr. Dime's house and Mr. Penny's house. We look at Mr. Penny's house and see that he does not have enough children to do the work at his house. With 72-48, we see that he has 2 children and needs more. We "walk over" to Mr. Dime's house and ask if we can borrow one of his kids. We have to mark out the 7 and put a 6 so he knows that we borrowed one of his kids...we wouldn't want him to worry! We put his kid in front of our 2 kids and we have 12 (we have already learned earlier in the year about adding dimes and pennies, so I don't have to say a dime = 10 pennies andd 10 +2 =12). Now we can do those 8 chores. We finish the math...

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