Estimation Jar Activity and Freebie


Here's what we've been doing the last couple of weeks as a math warm-up.  I have a plastic Estimation Jar that the kids take home (1 or 2 different children each week).  

An email went home explaining to the parents that their child needs to bring in between 20 and 50 objects for the class to estimate.

There is SO much great math that goes along with this activity. First we pass the jar around the circle and everyone makes an estimate (a smart guess) which they call out and I record on the white board.

Then I draw a number line and we place the smallest and greatest estimates on either end. We then spend a bit of time figuring out where some of the other numbers would be placed on the line. I have the kids justify their responses.

Next step is to count the objects.  In this picture, you can see the child who brought in some googly eyes. She's putting them into groups of 10. We count up to 10 for each group and then I say, "So four tens is how much?" and the kids respond.

I then circle the winning estimate, put a check mark beside the close estimates and write the expanded notation on the white board.

If you'd like a copy of an Estimation Jar label, just click on the image below.

Don't forget to enter my giveaway for this seriously amazing math book:

Click the book to enter :)

Have a great evening!


  1. Zero the Hero leaves us a smart guessing game every time he visits. It makes sure that we estimate every 10 school days. Bless that math oriented super hero!

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  2. I love estimation jars! So many different math concepts to incorporate. I love all the things you do with it!
    Conversations in Literacy

  3. What a great idea... I've never thought about having different families fill the estimation jar. This is a great family and classroom activity. You are brilliant!

    Granny Goes to School

  4. I love the home school connection you've created. Thanks for the wonderful teaching ideas about it. Angie

  5. I do an estimation jar too. It's fun seeing how others use it.


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