I came up with this interactive powerpoint presentation to teach the concept of estimation. This powerpoint includes a short definition, examples of what we might estimate, a cute youtube video that is linked in the presentation, and a guided discovery lesson where the children estimate how many teddy bear counters are inside of two glass containers.
I put 10 bears in the first jar and 25 in the second so the children could visibly see that the second jar had more without even counting them.
I also used tally marks to mark down the children's estimates so more than one skill would be reinforced.
If you have any questions, please feel free to contact me!!