Adding Tens and Ones

Regrouping Ones and Tens to Add

Open Ended

Write 483 in expanded form.

Use objects to regroup to solve

326 + 217 =

When is it necessary to regroup ones?

Why is it important to add the ones first when adding three-digit numbers?

Vera picked 456 strawberries from her farm. How many strawberries did they pick in all?

Open your textbook to page 371.

• Use base-ten blocks.

• Out library has 146 books about dogs.

• It has 145 books about cats.

• How many books about cats and dogs does the library have?

• Write the number sentence.

How is three-digit addition like two-digit addition?