Main goal of the assignment:

Show that you can explain verbally how to add 3-digit numbers using the standard written algorithm, as if to a child who knows how to add 3-digit numbers using base 10 blocks.

Secondary goal of the assignment:

Learn how to make a screencast.

Guidelines for the math: You will be showing how to subtract 527 - 149 using base 10 blocks, and explain step by step how to write that down in the standard algorithm.

A video of me doing the same thing for 643 - 276 using an online tool for base 10 blocks. This video also shows how to open the Smart Notebook using Notebook Express.

Things I'll be looking for:

• Do each step first with manipulatives, then write down the result in the number algorithm.
• Explain each trade using language similar to "trade 1 ten for 10 ones" (tell what you're trading in and what you're trading it for)
• Use lots of place value language: don't call the "4" in 643 "four", call it "four tens" or "forty".
• Use subtraction language in the right order: in the ones place we want to take away 6 from 3 (and can't, yet), we're not taking 3 away from 6.

Technology tools:

You will need to use a technology tool that will let you use virtual base 10 blocks. I recommend opening the Smart Notebook Base10.notebook with Smart Notebook Express and using its tools for your base 10 block work. This is how I show it in the above video.

You will need a technology tool that will let you record the screen, and record your voice explaining what you're doing. UWRF gives you access to Camtasia Relay to do this.

Recording using Camtasia Relay Recorder

• First download and install Camtasia Relay Recorder. Here are instructions on how to do that.
• Log in to Kaltura Media Space by following the instructions on page 2 of the Relay-Kaltura instructions (the tech support guy I talked to at DoTS recommended logging in once before using the recorder, just to get everything set up) (follow the link to https://uwrf.mediaspace.kaltura.com/ and then use the Login button at the upper right to get to the login screen)
• Get ready to record:
  • Make sure the notebook is open in Smart Notebook Express. Make it nice and big (full screen) because Relay will record the whole screen.
  • Make sure that you have a microphone on your computer (if you are using a laptop, you can use the built in microphone, if you are using one of the campus computer lab computers, you will need to check out a microphone to plug in)
• Record your explanation. Here are instructions on using Camtasia Relay Recorder to record yourself. Here's a video of me doing it.
• Submit your recording to have it saved
• Check your email (it will take maybe 20 minutes to process the video) and go back to Kaltura to see your video.
• Click on the link to your video, and use the share button to get a link to submit to me.
• Paste the link into a Word document and put it in the D2L dropbox to submit it to me.

Other recording options

If you love playing with computers, you might want to check out some other options for recording screencasts (also free).

• Jing (cool options, standalone program, only records 5 mins at a time)
• Screencast-o-matic (even more cool options, requires Java and internet while recording)