Tuesday, January 29, 2013

Fraction Folding--discovery learning

hands on fraction activities
Warning:  Wordy Blog Post Today!

Today we kicked off our fraction unit, and I think I am going to really try to do a lot of blogging about it over the next few weeks--because I will be immersed in it AND because it is such a critical component of the Common Core for intermediate grades.  I think it is vital that we dialogue about ways to help students build their understanding of fractions, so I invite you to share along with me as I "trace" the path of our unit as it unfolds.  I'll try to be clear--but you know how I tend to get wordy!  I'll try to include lots of photos and work samples as I go, and I am hopeful that the rest of you will share great ideas and resources that have been successful for you.

Again, knowing that the CCSS places a great deal of importance on fractional understanding, our district math team made a decision to build in two fraction units into our year--this one and another one later which will work to tie together decimals, fractions, and a more sophisticated level of understanding.

Today I started by asking students to reflect on what they already know about fractions and to rate their overall confidence (using our 4  3  2  1 ) scale (Click here to revisit earlier blog post about this!) and the results were quite amazing!  In a ten minute writing time, I got to witness a number of misconceptions, poorly explained reasoning, and a bunch of "3's" and "4's" in confidence!  Good thing I had planned on starting slowly!  Today we started our new math notebooks, and I explained to the students that we are "raising the rigor" one level more (poor things have heard this all year) and we are going to work hard to use our new notebooks to both record our thinking, our practicing, and our new learning.  I am going to try a version of interactive notebooks, knowing that I cannot do it in true form as some teachers do . . . I'm just not quite there yet.  I'll blog more about this later as it unfolds!  For today, we started the section we called "Fraction Concepts" and even talked about what the word "concept" means.  Fascinating!  I told the students that our job through this unit would be to determine some things we could determine to be "true" about fractions and that we would be working our way through a number of these "truths" during the unit.

Today's "truth" involved ensuring that students understand that fractions represent equal parts of something (I didn't really want to use the term "whole" yet--I don't really like to treat fractions of "objects" and "sets" differently until I have to!) and that we would be spending some time creating equal parts.

I put the students into pairs (I love popsicle stick picking!) and gave them each 3 minutes to find a classroom object that was either a square, rectangle, or circle and was bigger than a deck of cards and smaller than a book.  Each team was then assigned a color of paper and the following task:

With your partner, trace and cut out your shape.  You will need many of these as the investigation unfolds.  Your job is to find ways to divide your shape into equal parts. . . first in two equal parts, then three, and so on.  


fraction unit
I made sure we had some circles, some rectangles, and some squares...

I then showed the students the following charts--each is labeled "halves", "thirds", "fourths", and so on.  As they discovered a way to fold their shape, they were asked to put it on the correct chart. . . and I was on the prowl for work that was not accurate and precise.


teaching fractions
Voila!  Posters are taped to the ground with deliberate "aisles" so they don't get trampled on!

fractions
Each poster is labeled with the word for the fractional part--I will use the words and different symbols interchangeably throughout the unit.  NOTE:  The chart does NOT say "1/3" because we were not identifying 1 out of 3 parts.

Students dug into their work and did need some frequent reminders about using straight edges, working carefully, and so on (I know--shocking!), but the were very engaged and thoughtful.  I heard some pretty nifty stuff like:

"Hey--as you try to get more pieces, the pieces get smaller!"

and 

"Man--it's a lot harder to fold the odd numbered pieces!"

and

"If you fold it in half and then in half again, each half gets cut in half!"

fraction unit
Tracing...
fraction activities
Using a straightedge for precision...
fraction lessons
Circles are the toughest as this team found!

As the period unfolded (and it became clear that this was going to be a TWO DAY investigation!), our charts began to fill up and things moved a little faster.
fraction lessons
The charts started to fill...first halves and thirds, then fourths and eighths...we'll see how it "unfolds" tomorrow!  Got to love a little math humor, right?
Tomorrow we will finish up our investigation and then ask ourselves if we have discovered any new "truths" to record in our notebooks.  Although I am pretty confident that my students would have been able to answer correctly if given a sheet of "shaded fractions" to identify, today's activity showed me that many students are missing some very critical understandings about equal parts and about patterns that arise when dividing shapes.  I'm pretty sure that the work we will do over the next few days is going to be very important to build a foundation for the more advanced skills coming.  If you aren't familiar with what the CCSS requires from students regarding fractions, I would encourage you to dig in and follow along with us as we try to construct meaning over the next few weeks!

***UPDATE***
This blog post is now a part of my comprehensive fraction unit available by clicking the image below.  Hundreds of teachers have now used it to change the way they teach fractions!  



4 comments:

  1. I really like this idea for the beginning of a fractions unit. I actually hate teaching fractions and always leave it to the end of the year! I love this way to activate their knowledge, thanks for sharing.

    Looking From Third to Fourth

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    Replies
    1. Thanks for coming! I plan on sharing lots of fraction ideas over the next few weeks, so stop back and check them out! Maybe I can change your opinion! :)

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  2. Great ideas, I'm coming along with you on the fraction adventure!

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