Sunday, January 6, 2013

Deep Sea Dive to Zero Open Number Line Subtraction Freebie

Classroom Freebies Manic Monday

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!


  1. What a great resource! I first used the open number line concept with my kiddos last year and I was amazed with how successful many of my students were. I am really excited to try this game with my students. I know that they'll love it. Thanks for the great freebie.

    Your newest follower,

    ❀ Kate
    Purely Paperless

    1. Hi Kate! Thank you so much! I am looking forward to having you guest blog! Be sure to link up with the Teaching Blog Circle above. I click around in there often and share through Facebook - get the word out, your blog looks super!

  2. I found your blog through Classroom Freebies, Too and I LOVE it. Such a super cute design and so many awesome resources :) Thank you for sharing your talent!

    The Brown-Bag Teacher

    1. Hi Catherine. I just visited you too and am a new follower. Be sure to link you blog to the Teaching Blog Circle so you can spread the word about your blog... Click on the tab above! Hope to see you there :)

  3. Great resource, thanks for sharing on Manic Monday!

    simply sprout

  4. Found and followed through MM! Thanks for the resource.

    Math is Elementary

  5. I'm also a huge Marilyn Burns fan!! Love her!

    Wild About Fifth Grade


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