# 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.

Q1:

Daniel used place value blocks to show how to add 425 and 369. What is the sum?

Q2:

Add 544 and 438. Use place value blocks if you need to. Hint: Do you need to regroup ones or tens?

Q3: 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. Q4:

Mason is solving .

He added the ones and regrouped 10 ones into a ten. Finish his work to find the sum.

Q5:

Find the following:

Q6:

What is the result of the following operation? Q7:

In this addition calculation, what digit should I write in the tens column? Q8:

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.

Q9: Remember to regroup the ones if they add up to 10 or more.

Q10:

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