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

In this lesson, we will learn how to add two three-digit numbers when we have to regroup ones and record the calculation in columns.

Lesson Video

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:

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

Will we have to regroup when adding these numbers?

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.