proportional reasoning how do you know? january 10, 2012
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Proportional Reasoning How Do You Know? January 10, 2012. Connie Laughlin Hank Kepner Rosann Hollinger Kevin McLeod Mary Mooney Heath Garland. We are learning to…. deepen our understanding of proportionality and its application. We will know we are successful when. - PowerPoint PPT PresentationTRANSCRIPT
we can explain when two quantities are in or not in a proportional relationship.
we can use proportional relationships to solve multistep ratio and percent problems.
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Does the conclusion make sense? Make a convincing argument to your peers about the quantities being in or not in a proportional relationship.
What distinguishes those that make
sense from those that don’t make sense?
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Superficial cues present in the context of a problem do not provide sufficient evidence of proportional relationships between quantities.
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#1 Make sense of problems and persevere in solving them.
#3 Construct viable arguments and critique the reasoning of others.
#6 Attend to precision.
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You put a measuring cup under a dripping faucet. The measuring cup had 6 ounces in it to begin with. You come back in 8 minutes and notice that there are now 10 ounces in the measuring cup. How many ounces will be in the measuring cup after 17 minutes?
Is there a proportional relationship?If so, identify the two quantities.If not, explain why not.
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One man can paint a bedroom by himself in 3 hours. How long will it take two men to paint the room if both men paint at the same pace?
Is there a proportional relationship?If so, identify the two quantities.If not, explain why not.
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Ratios and Proportional Relationships
Analyze proportional relationships and use them to solve real-world and mathematical problems.7.RP.2 Recognize and represent proportional relationships between quantities.a. Decide whether two quantities are in a proportional relationship.
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“The kind and level of thinking required of students in order to successfully engage with and solve the task.”
Stein, Smith, Henningsen, & Silver, (2000)
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TASKSAs they appear in curricular/ instructional materials
TASKSAs set up by teachers
TASKSAs implemented by students Student
Learning
A representation of how mathematical tasks unfold during classroom instruction. (Stein & Smith, 1998, Mathematics Teaching in the Middle School)
Low Level Cognitive Demands
Memorization Tasks
Procedures Without Connections to understanding, meaning or concepts Tasks
High Level Cognitive Demands
Procedures With Connections to understanding, meaning or concepts Tasks
Doing Mathematics Tasks
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