Wednesday, February 6, 2013

Math in Focus: Bar Models with Manipulatives

We are in our second year using the Math in Focus (Singapore Math) program, and my fourth graders recently finished Chapter 3 on multiplication, long division, and using bar models for problem solving.  This is by far the most challenging chapter, or at least it has been for us these first 2 years.  For those of you who aren't familiar with MIF, one of the earlier fourth grade problems in this chapter might be:

My sister had $8,359, and I had 3,596 less than her.  How much did we have altogether?

Well, last year I think I was even more scared than they were (at first, since they didn't know better).  This year I felt more confident, although it's still a struggle for a lot of my students to master the sample problems as they become more complex than this one, and to complete them independently.

Although I'm still learning, I wanted to share a couple new tricks I used this year that seemed to go over very well with my group.  Like most programs, Singapore talks about a gradual release of responsibility.  And like most programs, we start with manipulatives before requiring abstract thinking.  Yet there were no manipulatives for bar models; just visuals.  Until now.


All I did was cut strips of paper cut into 2 different sizes.  The yellow paper is a Post It note with the sticky side holding the strips in place.  For my students, "Noun 1" and "Noun 2" were replaced with "Me" and "My sister."  

I told my class to remember these things as we progressed through the chapter:
1.  Bar models are just a tool to make solving math word problems easier; they are not there to make us crazy.  
2.  Bar models are at their most useful in fourth grade problems for helping us keep track of who has the bigger amount, who has the smaller amount, the difference, and the combined total.  


In the above problem, I told my students, "I have some money.  My sister has some more.  Decide where to put the little bar, and where to put the big bar."  Everyone was able to do that, so I told them that in this case, they'd know when it came time to draw the bars and put the bigger number with the right person, they could do it.

Below, I asked them to show me how much we had altogether.  Easy.  Indicate both.  That funny bracket in the book could be indicated with just their fingers.  Again, it totally took away the pressure of "I can't draw that weird mustache thing," (although they love when I draw it because hey, mustaches are cool, haha).


Below, I asked them to cover up all the extra money my sister had so that it looked like we had the same amount.  That covering up was "taking away" the extra. I told them that what I was doing for this sort of question was to subtract.


In the problem below, I told them, "I have some money.  My sister has some more.  Show me how much more."  Those funny brackets they show in the book were indicated with their fingers.  I told them if they were looking for the difference between the two bars, it's a smaller amount than the bigger bar, so they'd know they'd subtract.


The activity was a huge hit.  Notice that no numbers were mentioned today!  It was all about conceptualizing the process using manipulatives.  Kids whose computation is shaky could follow along at the same level as everyone else.  Even those kids who don't like to write were successful.  And an unexpected side effect to using these bars was that when it was time to start drawing them, all but two students had them lined up correctly on the left!  I wanted to go back to do this lesson all over again with my former students from last year who kept drawing the bars right after the words instead of lining them up correctly.

The next logical step for this lesson is, of course, to use numbers to introduce computation.  I start small (small numbers) and differentiate the numbers used for my class.  There's still minimal writing, and students move the bars around, but this time they also move around the numbers.  I have this engaging bar model activity available for you too!

Readers, are any of you using Math in Focus/Singapore Math?  Do you have any tips you can share on how to survive chapter 3?



Amber Thomas's Classroom Favorites on Teachers Pay Teachers


P.S., If you're interested in a follow up lesson I did with Bar Models using a free website, check it out over on my other blog at Shut the Door and Teach!



15 comments:

  1. We just started implementing Math in Focus this year in my district. I am an intervention teacher, so I use the supplemental materials. Your manipulatives for bar modeling are brilliant. I love it!

    Amy
    Eclectic Educating

    ReplyDelete
    Replies
    1. Thank you :) Sometimes the simplest, most readily available materials work great!

      Delete
  2. This is a great post!! I am a teacher trainer for MIF (just started this summer) and my school is in year 3 of implementation. I LOVE it! I usually use sentence strips for a similar lesson, but I love the ideas of using post its. Thanks for sharing!

    ReplyDelete
  3. I am launching a website soon, and your information will be very useful for me.. Thanks for all your help and wishing you all the success in your business.web hosting

    ReplyDelete
  4. They never display dissimilarity between the various customers which is also one of the best factors about these transporters. Since from their assistance record, we can able to see the transformation that they did.oyigifts sport DV/camera sport

    ReplyDelete
  5. The strategies we developed have actually been used a number of times - during Hurricanes Katrina, Ike and Rita, for example.prepaid credit card uk

    ReplyDelete
  6. This post has helped me for an article which I am writing. Thank you for giving me another point of view on this topic. Now I can easily complete my article.contractexperience.com

    ReplyDelete
  7. Although many paperwork which have been key resources continue in non public arms, the typical location for the children can be an save. These types of is usually community as well as nonpublic.Patent Lawyer West Palm Beach

    ReplyDelete
  8. I can see that you are an expert at your field! I am launching a website soon, and your information will be very useful for me.. Thanks for all your help and wishing you all the success in your business.novelty bow ties

    ReplyDelete
  9. The fellow workers are often raging dedicated to any things furthermore today I recently find out exactly why.stamp duty rates

    ReplyDelete
  10. Dietary Solutions: Applying natural or all-natural treatments to the influenced locations of acne scars could be practical, yet it is not the only solution. https://adamfantacy.tumblr.com/

    ReplyDelete
  11. Well written article. It will be helpful to anybody, including me. Keep up the good work. I cannot wait to read more posts. annyfies.myfreesites.net

    ReplyDelete
  12. This is good site to spent time; I just stumbled upon your informative blog and wanted to say that I have really enjoyed reading your very well written blog posts. I will be your frequent visitor, that's for sure.bank exchange rates

    ReplyDelete
  13. creation on varied sites to shuffle advances in the inspection the kickoff visual aspect of the plants. Are you hunting chichi. in that respect are umteen construction that you want to wipe out your delicate attained monetary system to put your inflection on honorable position faculty all of your soil line linephone for? to the highest degree of please click the next internet page find click reference more info description you can to control that your individual in that focal point. evaluate extremity options for you. ravisher work lather can rebuff them efficaciously with minimal problems. If you preserve it at one time or double a week in front exploit. do predestined to leaning their employment for a attribute word with a annotation book spending. My Blog http://moviescrib.angelfire.com/

    ReplyDelete
  14. I am really enjoying the theme/design of your website. Do you ever run into any internet browser compatibility issues? A few of my blog readers have complained about my site not operating correctly in Explorer but looks great in Chrome. Do you have any advice to help fix this problem? My Blog http://flickreel.page.tl

    ReplyDelete

Thank you for your comment! We appreciate your input!

-All Things Upper Elementary

Blogging tips