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






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