New to my posts on estimating and counting routines? Check them out. They are quick and no prep lessons that get at a variety of important number skills and are easily differentiated to meet a variety of needs.
This lesson took place with a group of four first graders. These are students who need a little more practice grouping into tens and ones and who I wanted to expose to numbers over 100. I also wanted to review reading and writing three digit numbers with these kids.
Our material of choice this time was plastic bingo chips
|Once the bingo chips have been spilled on the table, most of the estimates increase quite a bit.|
I take this opportunity to have the students figure out how many bingo chips we have pulled out by counting by 10's. First graders should be able to fluently count forward and backwards by tens up to 120. This obviously took us a bit out of that range but good practice anyways. I also had several different kids start to see if we would always get 150. I also had them count backwards by tens from 150 as well.
Then students had one last opportunity to adjust their estimates. One student mentioned that she thought we had taken half of the bingo chips and there were half left. We had a great discussion about what this meant and how it would help us estimate.
|Now we each have 40. I had one student write 40 on the board and we discussed why we write four zero to mean 40.|
When we figured out we had 308, I gave each kid a marker and had them go to the board and write the number 308. As you could predict with first graders, I got several responses.
|One students' attempt to write 308|
|Another students' attempt to write 308.|
We also had a great discussion about how we had 30 groups of 10 on the table and even when we arranged the 30 groups of 10 into 3 groups of 100, we could still see the tens.
How do you work on counting and estimating in your classroom?