Open Number Line Strategy: Addition & Subtraction

The math strategies we teach today probably feel like a foreign language to most parents.  Most parents were probably taught to use the standard algorithm for multi-digit addition and subtraction. That's pretty much the only strategy we used back in the day.  It worked, right?  Well, like I've said before... when you know better, you do better.  And we know better now.  We know that teaching students number sense and strategies based on place value before going to the shortcuts of borrowing and carrying is the way to go.

Side note: if ya DON'T know that yet, or if you are new to teaching math, you should probably read this book! It's amazing! The authors go into detail with the research behind the math, and why the shortcuts and algorithms (when used too early) we were taught don't lead the the deep kind of long-term understanding necessary for continued success in math.

But how do you explain that to parents? How can they help little Johnny with his math homework if they have no idea what we've taught him?  Communication is key! For each new strategy taught, I would send home a note (doesn't have to be a full page... can just be a slip of paper attached to the homework) explaining and demonstrating the strategy.  Another option is to make short YouTube videos of yourself working out a problem using the strategy or using an app like ScreenChomp.  Upload the videos to your school webpage, send an email with the link, or embed the link in a text using a service such as Remind.

I have some great packets in my TpT store, including a FREEBIE, for teaching two- and three-digit addition and subtraction using an open number line.  Included in those packets are strategy pages you can share with parents and students to make using the strategy simple.

Check them out! Click the thumbnail image for a link to my store. Thanks for stopping by!