Double digit addition with regrouping is another tricky concept for children to learn and understand.
I’ve always used MAB blocks (place value blocks) to teach double digit addition. But before I even begin to teach the concept my students need to have a very sound understanding of place value and how to decompose numbers into tens and ones. They really need to know that fifteen is fifteen ones and also one ten and five ones if they are going to understand why we regroup.
Using Manipulatives to teach addition with regrouping
To introduce regrouping I have a tens and ones chart for every child. I must admit mine are not very flash. The kids themselves fold a piece of card in half and write tens on one side and ones on the other.
Then we practice making a two digit number by placing our ones in the ones column and our tens in the tens column. Underneath that we make another two digit number and then we add.
Always add the ones first. This part doesn’t come naturally because it contradicts the way that numbers are read (left to right) and kids will generally want to add the tens first. So right at the very beginning of double digit addition, even before we introduce regrouping, we need to reinforce this concept.
We push the ones together; 7 and 9 makes 16. Do we have enough ones to make a ten? (This is why kids need to have a good knowledge of tens and ones.) Yes we do. We trade 10 ones for a ten. Can we leave it in the ones column? No we can’t. We put it in the tens column. Now we have 3 tens and 4 tens + 1 more ten. We push them together and look at our answer – how many tens, how many ones? What’s our answer? 37+49 = 86.
Once my kids understand this stage we move onto modeling and writing the equation.
Once the concept is understood we can put away the MABs and just write the equations. This is when I love to bring out the games.
Practicing addition with regrouping using games
Let’s face it, writing pages of equations is boring but writing equations in order to win a game is not.
Kids can write down the equation they land on and find the answer on the game board.
Or spin two numbers, add them and move their game marker to that answer.
After recording the equation in their notepads or on a recording sheet (provided in this game pack), students need to use their knowledge of place value to determine where the answer will fall when they use this game.
To move ahead on this game board, students must spin two numbers and add them but they can only move to the next planet if their answer is there.
In this game students record the equation, cover the answer and try and get four in a row to win.
Love a Freebie?
Everyone loves a freebie. You can find this two digit addition with regrouping game in my resource library (AKA Free Teaching Treasures) …
Grab a game pack
Looking for a fun way to reinforce double digit addition with regrouping? To grab the pack from my TpT store just click on the linked picture below.