Rewrite 2-digit addition problem
What are the two different ways to write addition problems?
Horizontal 2-digit addition
Vertical 2-digit addition
Model & Draw
For 28, write the tens digit in the tens column.
Write the ones digit in the ones column.
Repeat for 45.
Add the ones
Regroup if you need to
Add the tens.
Listen and Draw
1. Juan's family drove 32 miles to his grandmother's house. Then they drove 14 miles to his aunt's house. How many miles did they drive?
Sample Math Talk:
How are the two problems alike? How are they different?
(vertical and horizontal addition sentence)How did you line up the two numbers you wrote?
Why is it important to line up the digits of these addends in columns?
What can happen if you line up the digits incorrectly when you rewrite addition problems?
Try it out!
Share and Show:
Make sure you read the direction carefully!
--> Reteach worksheet 4.8
Group 3 --> work with Ms. Yeung
On Your Own --> do odd numbers only
Wrapping Up/ Exit Slip
17 + 5 = ?
Math Journal: What will happen if you line up the digits incorrectly when you rewrite the addition problems?