Round multi-digit numbers to any place value in more complex cases, including those involving real-world contexts and/or assessing the reasonableness of that estimate.
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This whole lesson provides an excellent opportunity for students to construct viable arguments and critique the reasoning of others regarding when to round and to what level of precision, based on the context of the problem (MP.3). “How close an estimate must be to the actual computation is a matter of context,” and thus “the goal of computational estimation is to be able to flexibly and quickly produce an approximate result that will work for the situation and give a sense of reasonableness” (Van de Walle, p. 195). Thus, these tasks offer an opportunity for a rich discussion where one’s decision about the degree of precision of an estimate should be supported by reasoning.
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In the year 2015, there were 935,292 visitors to the White House. They each got a map to guide them around. President Obama said that they can round to the nearest thousand to decide about how many maps to order for next year. Do you agree or disagree with President Obama? Explain.
Grade 4 Mathematics > Module 1 > Topic C > Lesson 10 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by The Match Foundation, Inc.2,837 students attend Lincoln Elementary school. How would you estimate the number of chairs needed at the school?
Grade 4 Mathematics > Module 1 > Topic C > Lesson 10 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by The Match Foundation, Inc.?
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There are 72,053 Google employees in the United States. For Google’s new headquarters, their CEO rounds the number to the nearest thousand to determine how many desks to order. Do you think his estimate is reasonable? Why or why not? Explain.
Grade 4 Mathematics > Module 1 > Topic C > Lesson 10 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by The Match Foundation, Inc.A company developed a student survey so that students could share their thoughts about school. In 2011, 594,500 students across the United States were administered the survey. In 2012, the company was deciding about how many copies of the survey to make. Round the number and explain why it is a reasonable estimate.
Grade 4 Mathematics > Module 1 > Topic C > Lesson 10 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by The Match Foundation, Inc.?