Add 3-digit Numbers Worksheets

Share this page to Google Classroom

There are five groups of addition with regrouping worksheets:
2-digit + 1-digit (eg. 48 + 5)
2-digit + 2-digit (eg. 64 + 29)
3-digit + 2-digit (eg. 543 + 39)
3-digit + 3-digit (eg. 648 + 594)
Multi-digit Addition (eg. 12,456 + 3,376)

Second Grade math worksheets to help students practice adding 3-digit numbers to 3-digit numbers.
How to add 3 digit numbers to 3-digit numbers?

Write the hundreds, tens, and ones digits of each number directly beneath each other.
Start with the rightmost column (ones place) and add the digits.
If the sum is 10 or less, write it below the line.
If the sum is greater than 10, write the ones digit below the line and carry over the tens digit to the next column.
Add the digits in the middle column (tens place), including any carried-over tens.
If the sum is 10 or less, write it below the line.
If the sum is greater than 10, write the ones digit below the line and carry over the tens digit to the next column.
Add the digits in the leftmost column (hundreds place), including any carried-over hundreds.
Write the sum below the line.

Have a look at this video if you need help adding 3-digit numbers.

Click on the following worksheet to get a printable pdf document.
Scroll down the page for more Add 3-digit Numbers Worksheets.

Check out our most popular games!

Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!

Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.

Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.

Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.