Deep Sea Dive to Zero Open Number Line Subtraction Freebie

Boy, did we have fun in math on Friday! With all of our addition strategies under our belts, we've been working on subtracting.  I have to say, the Common Core focus on Numbers and Operations in Base 10 has really helped with addition and subtraction both with and without regrouping.

My students are practicing their facts through games every day during Guided Math.  They play these games "in the workshop."  To review addition facts, they are still having a blast with my Math Facts Superheroes Games.

However...they have also been really enjoying some wonderful subtraction games I bought from Fun Games 4 Learning:

Getting back to Friday... We are focusing on splitting numbers into tens and ones to subtract.  This is a strategy I find very helpful for the kids.  Many of the strategies that I am using come from Marilyn Burns: Do The Math.  It's a GREAT resource for teaching addition and subtraction strategies!

I made a game based on how Marilyn uses splitting tens and ones on an open number line to subtract.  I played this game with the whole class. 

 That's right, it was me against all of them- and they LOVED it! Each child had a game board, a die and an Expo marker.  I took a turn and explained my thinking of whether I should subtract tens or ones to get closest to zero.  Then the kids all took their turn at the same time.  After each roll, we announced who was "closest to zero" at that point.  The game is only 6 rolls long, but it is pretty intense - you cannot go under zero before your 6 rolls are up or else you lose a turn.  The person closest to zero at the end of the game is the Deep Sea Diving Champion!

When it was time for me to pull groups for Guided Math, the kids who remained in the workshop all chose to play this game again.  It was a winner,  and I am giving it to you for free.  Enjoy!