Every week in our class we practice the skill of estimation using our class estimation jar. This is how we do it.
First, we look at the items in the estimation jar. Last week it was filled with glittery pompoms. We each estimate how many things are in the jar and write our estimates on a sticky note.
Then we take our sticky notes and put them on a number line so we can see the range of our estimates. Last week, the range of our estimates went from a low of 52 to a high of 10,000 pompoms! As we practice and learn more estimation skills, we expect our range will get smaller.
We graph our estimates in our Class Estimation Book. These copies came from Creative Mathematics.
Then our counting committee counts the items and we see how close our estimates were. Last week there were 200 pompoms in the jar. Two people guessed that number exactly! We record our actual answer on our estimation jar poster.
This week our jar is filled with Unifix cubes.
How many cubes do you think are in the jar?
What else should we put in our estimation jar?