Welcome to our 3 Digit Addition Worksheets page.

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.

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

More Recommended Math Worksheets

Take a look at some more of our worksheets similar to these.

3 Digit Subtraction (& Addition) Worksheets

How to Print or Save these sheets

Need help with printing or saving?
Follow these 3 easy steps to get your worksheets printed out perfectly!

How to Print or Save these sheets

Need help with printing or saving?
Follow these 3 easy steps to get your worksheets printed out perfectly!

Math Salamanders Shop

Looking for some fun printable math games?

We have some great games for you to play in our Math Games e-books!

NEW Online Age Calculator

Do you know how old you are...in weeks? days? hours?

Are you more than a million minutes old?

Find out how old you are to the nearest second!

NEW Fraction Calculators

We have updated and improved our fraction calculators to show you how to solve your fraction problems step-by-step!

Take a look and try them out!

New Math Sheets & Resources

Check out our LATEST webpages.

Some of our TOP pages!

Have a look at some of our most popular pages to see different Math activities and ideas you could use with your child

Support Us

If you are a regular user of our site and appreciate what we do, please consider making a small donation to help us with our costs.

Get a free sample copy of our Math Salamanders Dice Games book with each donation!

FUN Math Games

Looking for a fun and motivating way to learn and practice math skills?

Why not try one of our free printable math games with your students!