Welcome to our 3 Digit Addition Worksheets page.

### How to do 3 Digit Addition

#### How to do 3-Digit Addition Step 1) Add the Ones digit of both numbers together.

• Write the number of Ones below the line in the Ones place.
• If the total of the two digits is 10 or more, then regroup the 10 Ones into 1 Ten and move it into the Tens column.

We add the Ones: 5 + 8 = 13 Ones.

We regroup the 13 Ones into 1 Ten and 3 Ones.

We carry over 1 Ten and move it to the top of the Tens column.

We write a 3 under the line in the Ones place. Step 2) Add the Tens digit of both numbers together, remember to add any Tens that were carried over.

• Write the number of Tens below the line in the Tens place.
• If the total of the two digits is 10 or more, then regroup the 10 Tens into 1 Hundred and move it into the Hundreds column.

We add the Tens, including the Ten we carried over: 1 + 2 + 1 = 4 Tens.

We write this number under the line in the Tens place. Step 3) Add the Hundreds digit of both numbers together, remember to add any Hundreds that were carried over.

• Write the number of Hundreds below the line in the Hundreds place.
• If the total of the two digits is 10 or more, then regroup the 10 Hundreds into 1 Thousand and write it into the Thousands place.

We add the Hundreds: 6 + 4 = 10 Hundreds.

We regroup the 10 Hundreds into 1 Thousand and 0 Hundreds.

As there are no further digits to add up, we write the 1 in the Thousands place and a 0 in the Hundreds place. ### 3 Digit Addition Worked Examples

#### Example 2) Work out 506 + 248. Step 1) Add the Ones digit of both numbers together.

• If the total of the two digits is 10 or more, then regroup the 10 Ones into 1 Ten and move it into the Tens column.

Adding the Ones gives us: 6 + 8 = 14 Ones = 1 Ten + 4 Ones. Write the 4 Ones below the line in the Ones place. Carry over the 1 Ten into the Tens column. Step 2) Add the Tens digit of both numbers together, remember to add any Tens that were carried over.

Adding the Tens gives us: 1 + 0 + 4 = 5 Tens. We write this below the line in the Tens place Step 3) Add the Hundreds digit of both numbers together, remember to add any Hundreds that were carried over.

Adding the Hundreds gives us: 5 + 2 = 7 Hundreds. We write this below the line in the Hundreds place. This gives us a final answer of 506 + 248 = 754

#### Example 3) Work out 482 + 176. Step 1) Add the Ones digit of both numbers together.

Adding the Ones gives us: 2 + 6 = 8 Ones. We write this below the line in the Ones place. Step 2) Add the Tens digit of both numbers together, remember to add any Tens that were carried over.

Adding the Tens gives us: 8 + 7 = 15 Tens = 1 Hundred + 5 Tens. We write 5 Tens below the line in the Tens place. We carry 1 Hundred into the Hundreds column. Step 3) Add the Hundreds digit of both numbers together, remember to add any Hundreds that were carried over.

Adding the Hundreds gives us: 1 + 4 + 1 = 6 Hundreds . We write this below the line in the Hundreds place. This gives us a final answer of 482 + 176 = 658

#### Example 4) Work out 974 + 389 Step 1) Add the Ones digit of both numbers together.

Adding the Ones gives us: 4 + 9 = 13 Ones = 1 Ten + 3 Ones. We write 3 Ones below the line in the Ones place and carry over 1 Ten into the Tens column. Step 2) Add the Tens digit of both numbers together, remember to add any Tens that were carried over.

Adding the Tens gives us: 1 + 7 + 8 = 16 Tens = 1 Hundred + 6 Tens. We write 6 Tens below the line in the Tens place. We carry 1 Hundred into the Hundreds column. Step 3) Add the Hundreds digit of both numbers together, remember to add any Hundreds that were carried over.

Adding the Hundreds gives us: 1 + 9 + 3 = 13 Hundreds = 1 Thousand + 3 Hundreds .

We write 1 in the Thousands place and 3 in the Hundreds place. This gives us a final answer of 974 + 389 = 1363

#### Example 5) Work out 728 + 457 + 66 Step 1) Add the Ones digit of the 3 numbers together.

Adding the Ones gives us: 8 + 7 + 6 = 21 Ones = 2 Tens + 1 One. We write 1 One below the line in the Ones place and carry over 2 Tens into the Tens column. Step 2) Add the Tens digit of the 3 numbers together, remember to add any Tens that were carried over.

Adding the Tens gives us: 2 + 2 + 5 + 8 = 17 Tens = 1 Hundred + 7 Tens. We write 7 Tens below the line in the Tens place. We carry 1 Hundred into the Hundreds column. Step 3) Add the Hundreds digit of the 3 numbers together, remember to add any Hundreds that were carried over.

Adding the Hundreds gives us: 1 + 7 + 4 = 12 Hundreds = 1 Thousand + 2 Hundreds.

We write 1 in the Thousands place and 2 in the Hundreds place. This gives us a final answer of 728 + 457 + 86 = 1271

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