When we got back into our classroom from lunch today, I asked the students to take out a pencil and their ruler and to measure the pencil to the nearest 1/4 inch.
I asked them to jot the number down on a scrap of paper and then I showed them the number line foundation for the number plot. I then invited all the students to come up and move an "X" to the correct location on the line plot (The "x" is cloned...for you fellow Smartboard users).
We then stepped back, and I asked them to look at the completed line graph and to tell me what information could be gathered from the graph. As the students came up with ideas, I recorded them--and it took a little teeth pulling to get some ideas rolling!
This was a great review of some of those "data landmarks" terms from earlier this year--terms that very obviously needed review! So then I showed them the advantage of a line plot--that we can really see how much each and every data point is worth. I reminded them that each "X" represents ONE pencil and asked them
"How far would our pencils stretch if we lined them up end to end?"
Without telling them more, I sent them on their way to work with their teams and I sat back and listened. They had some great strategies! I saw everything from
|NOT the right answer, but a cool strategy!|
to students "grouping" the numbers in a huge variety of ways. Some added each "value" (added up all the 4 1/2's and so on), some added in chunks . . . like this
and we ended up with MANY different answers! It became a great lesson in how to keep work organized, how to be "systematic" with what you are doing, and also a great ESTIMATION lesson. I asked them how long a line of 21 pencils would be if each were a foot long--and then what if each were only 1/2 a foot long. We looked at our line plot and decided our answer should be pretty close to that.
I then sent them back to work to finish and asked them to figure out how many inches AND how many feet and inches (back to our measurement conversion lessons!) that line of pencils would be. For those who finished early, I asked them to consider the following:
All in all, it was a pretty cool 35 minute math lesson--and we will follow up tomorrow with some more "hands on" line plot activities. Hope everyone had a great Monday!