# 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.

Q1:

Michael 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 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. Q4:

Use , , or to fill in the gap: .

• A
• B
• C

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?