Title – Subtracting with Zeros using the Box and Regroup Method
Audience – Teachers who wish to incorporate technology/audio/visual in their lessons, specifically for Third Grade Math.
Purpose – To give teachers a resource on how to simply subtract when there is a zero that needs to be regrouped. This video focuses on 3 digit numbers. We call this "Box and Regroup."
My Uses – This video can be used as an instructional tool for strategies of how to subtract across zeros.
My Learners’ Uses – Teachers will learn how they use a screencasted video lesson to utilize as another resource for their math instruction.
Audience – Teachers who wish to incorporate technology/audio/visual in their lessons, specifically for Third Grade Math.
Purpose – To give teachers a resource on how to simply subtract when there is a zero that needs to be regrouped. This video focuses on 3 digit numbers. We call this "Box and Regroup."
My Uses – This video can be used as an instructional tool for strategies of how to subtract across zeros.
My Learners’ Uses – Teachers will learn how they use a screencasted video lesson to utilize as another resource for their math instruction.
Screencast/ Text
Audio Narration
Initial blank screen
Hello and welcome back, we are now going to focus on a strategy called Box and Regroup.
Screen with sample problem 700- 432
Let's start with the number 700 and then we will subtract 432.
The Traditional method tells us to take a ten and go to the next place value but let's look at the number 70 because 70 tens is the same as 700. Put a box around the 70. Now we can borrow/ regroup one set of tens from that number. So then 70 becomes- you guessed it... 69.
Because we took away a ten here, we have to go to the ones place. Now, we are ready to find our difference... Always starting from the ones column, 10 minus 2 is 8. 9 minus 3 is 6. Finally, in the hundreds column we have 6 minus 4 is 2.
So as you can see, the difference between 700 and 432 is 268.
Thank you message screen
Thank you for being an engaged learner! I hope that you have a better understanding of the box and regroup method. See you next time!