Lesson Worksheet: Column Addition of Three-Digit Numbers: Regroup Ones Mathematics • 2nd Grade

In this worksheet, we will practice adding two three-digit numbers when we have to regroup ones and record the calculation in columns.


Daniel used place value blocks to show how to add 425 and 369.

What is the sum?


Add 544 and 438. Use place value blocks if you need to.

Hint: Do you need to regroup ones or tens?


Use the place value blocks to help you add 617 and 238.

Will we have to regroup when adding these numbers?

  • ANo
  • BYes, we will regroup the tens.
  • CYes, we will regroup the ones.

Add the ones. Write the missing digit.

Hint: What do we do if we have 10 ones?

Add the tens. Write the missing digit.

Add the hundreds. Write the missing digit.


Mason is solving 518+242.

He added the ones and regrouped 10 ones into a ten.

Finish his work to find the sum.


Find the following: 236+148


What is the result of the following operation?


In this addition calculation, what digit should I write in the tens column?


Look at how James solved an addition problem.

Now look at this problem.

Do you need to regroup ones to make a ten when adding?

  • ANo
  • BYes

Use James’s method to find the answer.


Add 148 to 235.

Remember to regroup the ones if they add up to 10 or more.


Add 237 and 53 using the place value blocks in the chart. The ones have already been regrouped for you.

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