# Worksheet: Column Addition of Three-Digit Numbers: Regroup Ones

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 number.

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

Add the tens. Write the missing number.

Add the hundreds. Write the missing number.

**Q5: **

Use , , or to fill in the gap: .

- A
- B
- C

**Q6: **

Uncle Noah lives on a farm that has 139 chickens and 231 cows. How many animals are on the farm in total?

**Q7: **

Mason is solving .

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

Finish his work to find the sum.

**Q8: **

Find the following:

**Q9: **

What is the result of the following operation?

**Q10: **

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

**Q11: **

Look at how William solved an addition problem.

Now look at this problem.

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

- ANo
- BYes

Use William’s method to find the answer.

**Q12: **

Find the total by first making ten.

**Q13: **

Find .

*Hint*: How can you break apart 4 to make a ten?

**Q14: **

Charlotte read 125 pages of a story yesterday. Today, she read only 6 pages. What is the total number of pages that she read?