Worksheet · Grades 3–4 · Column methods
Column Addition Worksheet
Two A4 pages: adding three-digit numbers in columns with regrouping, three addends, estimating, missing digits and an answer key.
Column addition
1 Work it out in writing.
Line up the places and start on the right.
2 Three numbers.
3 Estimate first.
Round to the nearest hundred and work it out in your head.
a) 279 + 113 ≈
b) 201 + 500 ≈
c) 279 + 126 ≈
4 Find the mistake.
Tick the wrong answers and work them out correctly.
5 Missing digits.
Which digits go in the blue squares?
★ Brain teaser
Use the digits 5, 3, 8, 6, 7, 1 to make two three-digit numbers with the largest possible sum.
6 Write them in columns and work them out. One digit in each square, places lined up.
a) 261 + 456
b) 242 + 578
c) 454 + 485
Column addition
1 Work it out in writing.
2 Three numbers.
3 Estimate first.
4 Find the mistake.
5 Missing digits.
★ Brain teaser
6 Write them in columns and work them out.
What is on the worksheet?
The example at the top adds the ones first and shows how a ten moves into the next column. Task 1 has three column additions with three-digit numbers, and task 2 adds three numbers at once. In task 3 your child rounds to the nearest hundred and estimates the sum. Task 4 has worked problems with mistakes to find, and task 5 asks for the missing digits in the blue squares. A brain teaser – make the largest possible sum from six digits – and three additions to set up in columns finish page 1. Page 2 has all the answers.
The numbers stay within 1000, and every digit has its own square on the grid.
Who is it for?
Grades 3 and 4, when the column method for addition is introduced or reviewed.
How to use it
Say the steps out loud: ones, tens, hundreds. Write the regrouped ten small above the next column, then compare the answer with the estimate.
Frequently asked questions
Is there an answer key?
Yes. Page 2 shows every answer and a short note for parents and teachers. You can leave it out when you print.
Can I get new problems?
Yes. “New numbers” opens the worksheet generator with the same topic and new numbers, as often as you like.
What does regrouping mean?
When the ones add up to 10 or more, the ten moves to the tens column. The same happens from the tens to the hundreds.