# 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.

**Q3: **

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.

**Q4: **

Mason is solving .

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

Finish his work to find the sum.

**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: **

Add 148 to 235.

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.