Base 10 Lesson 3: Teaching 2-digit addition and subtraction by demonstrating and explaining.

For this assignment, I want to hear the language you'll use to describe the process of adding and subtracting 2-digit numbers using the standard algorithm and base-10 manipulatives. I've simplified the assignment a lot since last year, but it's still kinda complicated.

Video explanation/demo

Step 1: download this Smart Notebook file: AddSub2DigAssn.notebook

Step 2: open Smart Notebook Express. Once you have Smart Notebook Express opened, you should open the file AddSub2DigAssn.notebook that you just downloaded.

If Notebook Express doesn't work for you, you should go to the Content section of our D2L site, and follow the instructions to download and install the full program Smart Notebook (note that you must install it after downloading).

Step 3: Put the manipulative and numerical steps in order on each of the Notebook pages

Step 4: Start a screen recording program.

• You can use Screencast-o-matic without installing anything on your computer. It seems to work well with Internet Explorer for me. You can create a free account to save your videos to, or you can save them to your computer.
• If you downloaded the full version of Smart Notebook, you can use the screen recorder: Smart Recoreder built into it. You will need to first add it to the tool bar (in the View menu, choose Toolbar Options and Customize) and drag the Smart Recorder onto the toolbar:
• . Click on it to start the recording tool
• You can download and install the free program Jing (very stable and reliable) http://www.techsmith.com/jing.html which will also let you create a free account on screencast.com to save your videos to.

Step 5: Record

• Make sure your microphone is working.
• Set the screen capture section of your screen recording program to include all of your Smart Notebook window.
• Start recording.
• Move the arrow around to point to the manipulatives or numbers you are talking about, and talk through how you would explain verbally adding and subtracting using the standard algorithm with both manipulatives and numbers.
• Make sure you do both the addition and the subtraction problem (If you want to, you can record the explanations in separate recordings if you want to).

Step 6: Save your recording and turn it in to the D2L dropbox. You may have saved it to a web site or to your computer.

• If you saved it to your computer, you should put it in the dropbox.
• If you saved it to the internet, you should copy the link into a Word document and put the document in the dropbox.
• If you did it in two recordings, make sure that both are uploaded to the dropbox.