# Addition with Regrouping - Ten  Rate this video

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CCSS.MATH.CONTENT.3.NBT.A.2

### In this 3 Digit Addition with Regrouping and Base Ten Blocks Video...

Mr. Squeaks successfully built a time machine, so he and Imani took a trip to see some dinosaurs. On the way home, they recount all the fun they had. However, when they start trying to add up all the dinosaurs they saw, they run into a problem. In this video, Mr. Squeaks and Imani learn about 3 digit addition with regrouping and base ten blocks.

### Teaching 3 Digit Addition Regrouping with Base Ten Blocks

We can use place value charts and base ten blocks to help model addition with regrouping. Ones are represented with single squares, tens with columns of ten, and hundreds as cubes of one hundred. In a place value chart, we build the addends in blocks to add and regroup, or move the blocks from one place value to another. This helps us to solve equations more easily. To begin, model your addends with base ten blocks in a place value chart. Add up the ones place. If the sum in the ones place is ten or greater, regroup as needed to the tens place and write the remaining total below. Next, add the tens place.If the sum in the tens place is ten or greater, regroup as needed to the hundreds place and write the remaining total below. Finally, count all the squares in the hundreds column and write the total below.

#### 3 Digit Addition with Regrouping Example with Base Ten Blocks

Let’s use two hundred sixty-five plus four hundred thirty-seven as an example to model three digit addition with regrouping base ten blocks. Begin by modeling the equation with base ten blocks. Put the first addend blocks in the place value chart. Then, put the second addend blocks below it. Start counting all the blocks in the ones column. There are twelve ones. Twelve is made up of one ten and two ones, so we need to regroup the set of ten. This set moves to the tens place. Two blocks are left in the ones column, so we write two below. Now, move on to counting in the tens place. There are ten columns of ten which means we have one hundred in the TENS place. We need to regroup the one hundred from the tens place to the hundreds place. After we do this, the tens column is empty. We write a ZERO here to show there are no tens here anymore. Finally, count the hundreds in the hundreds place. There are seven hundreds, so we write seven below the hundreds place. ### Summary of Steps: 3 Digit Addition with Regrouping and Base 10 Blocks

• First, model your addends with base ten blocks in a place value chart.

• Next, add up the ones place. If the sum in the ones place is ten or greater, regroup as needed to the tens place and write the remaining total below.

• Then, add the tens place.If the sum in the tens place is ten or greater, regroup as needed to the hundreds place and write the remaining total below.

• Finally, count all the squares in the hundreds column and write the total below.

Have you practiced yet? On this website, you can also find three (3) digit addition with regrouping base ten (10) blocks worksheets and exercises. These 3 digit addition with regrouping worksheets for 3rd grade will help get you started!

## Addition with Regrouping - Ten Exercise

Would you like to practice what you’ve just learned? Practice problems for this video Addition with Regrouping - Ten help you practice and recap your knowledge.
• ### Which number does each set of blocks represent?

Hints

How much is each one of these worth on their own?

If we add these base 10 blocks together we are adding 100 + 10 + 1 which equals 111

Solution

These base 10 blocks represent the number 204.

Remember:

• the small green cubes are worth 1
• the long blue rods are made up of ten ones, so they are worth 10
• the large red squares are made up of ten tens rods or 100 ones cubes, so are worth 100
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20

• Two tens rods.
• 10 + 10 = 20
45
• Four tens rods and five ones cubes
• 1 + 1 + 1 + 1 + 1 = 5
• 10 + 10 + 10 + 10 = 40
• 40 + 5 = 45
125
• One hundred square, two tens rods and five ones cubes
• 1 + 1 + 1 + 1 + 1 = 5
• 10 + 10 = 20
• 100 + 20 + 5 = 125
130
• One hundred square and three tens rods
• 10 + 10 + 10 = 30
• 100 + 30 = 130
204
• As shown in the image
• Two hundred squares and four ones cubes
• 1 + 1 + 1 + 1 = 4
• 100 + 100 = 200
• 200 + 4 = 204

• ### How many teeth did Mr. Squeaks and Imani see?

Hints

Remember to start by adding in the ones column then move to the tens and then the hundreds.

Don't forget to carry over if you are left with a 2-digit number.

For example, if we were adding 28 + 17 we would add 8 + 7 to get 15. We would leave 5 ones in the ones column and carry the ten across.

Solution

Mr. Squeaks and Imani saw 272 teeth.

• We start by adding the ones. 7 ones plus 5 ones equals 12 ones. We then need to re-group the ten and write 2 in the ones place.
• We then add the tens. 2 tens plus 4 tens plus the ten we re-grouped equals 7 tens, so we write 7 in the tens place.
• We then add the hundreds. 1 hundred plus 1 hundred equals 2 hundred, so we write 2 in the hundreds place.
• 2 hundred plus 7 tens plus 2 ones equals 272.
• ### Are these numbers correct?

Hints

Check that the hundreds have been counted correctly, then the tens and then the ones.

For example, here there are 6 tens rods which equals 60.

Solution

Oops! Mr. Squeaks and Imani have made a few mistakes!

Remember to look carefully at how many of each base 10 blocks there are.

• The first number sentence should have read 100 + 30 + 4 because there are three tens rods, not two.
• The second number sentence should have read 200 + 40 + 7 because there are seven ones cubes, not eight.
• The third number sentence should have read 100 + 40 + 3. There is only one hundred square, not two and there are four tens rods, not three.
• The fourth number sentence should have read 300 + 70 + 7. There are three hundred squares, not four. There are seven tens rods, not 8 and there are seven ones cubes, not eight.
• ### How many leaves have the dinosaurs eaten?

Hints

Remember to add the ones place first.

Don't forget to add anything you have carried over.

For example, if we add 13 + 8, we would add 3 + 8, which equals 11. We would leave the one in the ones column and carry a ten across.

Solution

Here is the answer for 134 + 247.

• We added 4 ones plus 7 ones, which equals 11 ones. We cannot put a two-digit number into ones place, so we re-group ten ones into the tens column and write 1 in the ones column.
• We now have 3 tens plus 4 tens plus 1 ten, which equals 8 tens so we write 8 in the tens column.
• 1 hundred plus 2 hundred equals 3 hundred, so we write 3 in the hundreds column.
• 3 hundred plus 8 tens plus 1 one equals 381.
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143 + 379

• 3 ones plus 9 ones equals 12 ones. We re-group ten and write 2 in the ones column.
• 4 tens plus 7 tens plus 1 ten equals 12 tens. We re-group a hundred and write 2 in the tens column.
• 1 hundred plus 3 hundred plus 1 hundred equals 5 hundred, so we write 5 in the hundreds column.
• 5 hundred plus 2 tens plus 2 ones equals 522.
121 + 165
• 1 one plus 5 ones equals 6 ones, so we write 6 in the ones column.
• 2 tens plus 6 tens equals 8 tens, so we write 8 in the tens column.
• 1 hundred plus 1 hundred equals 2 hundred, so we write 2 in the hundreds column.
• 2 hundred plus 8 tens plus 6 ones equals 286.
248 + 332
• 8 ones plus 2 ones equals 10 ones. We re-group ten and write a 0 in the ones column.
• 4 tens plus 3 tens plus 1 ten equals 8 tens, so we write 8 in the tens column.
• 2 hundred plus 3 hundred equals 5 hundred, so we write 5 in the hundreds column.
• 5 hundred plus 8 tens plus 0 ones equals 580.

• ### How many dinosaur bones did Mr. Squeaks see?

Hints

Remember to start by adding the ones then move to the tens and then the hundreds.

Remember to check how many of each place value there are altogether and place this number at the bottom.

Solution

Mr. Squeaks saw 175 bones!

• 2 ones plus 3 ones equals 5 ones
• 1 ten plus 6 tens equals 7 tens
• 1 hundred plus 0 hundred equals 1 hundred
• When we put these together we get a total of 175
• ### Can you find the totals?

Hints

If you don't have any of your own base 10 blocks you could draw some like this to represent each number and then add them together.

If you are adding three numbers you still follow the pattern of adding all of the ones first, then all of the tens and then all of the hundreds. Don't forget to add any you have carried over.

Solution

Mr. Squeaks and Imani saw 353 diplodocus!

• We add 9 ones plus 4 ones which equals 13 ones. We re-group ten and write 3 in the ones column.
• We then add 2 tens plus 2 tens plus 1 ten which equals 5 tens so we write 5 in the tens column.
• Finally we add 1 hundred plus 2 hundreds which equals 3 hundreds so we write 3 in the hundreds column.
• 3 hundreds + 5 tens + 3 ones equals 353.
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Following the same method Mr. Squeaks and Imani saw:

• 435 bones
• 452 pterodactyls
• 406 eggs