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FIND THE SECRET NUMBER—DEVELOPING A SEARCH STRATEGY

Grades: 2‒6

This activity challenges students to deduce a number by collecting and analyzing clues that narrow its range of possible values. The activity familiarizes students with inequality signs ( > and <), introduces the use of the variable x to represent an unknown value, and motivates them to develop strategies for finding the number in the fewest guesses.

OBJECTIVES 
  • Students will interpret inequality symbols (> and <) signs correctly.
  • Students will be introduced to the use of x to represent an unknown value.
  • Students will develop, compare, contrast, and execute a variety of search strategies for identifying a secret number.
  • Students will develop a sense of the uniform distribution of numbers on the integer number line.
  • Students will extend their understanding of the ordering of integers to the negative integers.

COMMON CORE CONNECTIONS 
Mathematical Practices

(1) Make sense of problems and persevere in solving them; (2) Reason abstractly and quantitatively; (3) Construct viable arguments and critique the reasoning of others; (5) Use appropriate tools strategically; (7) Look for and make use of structure.

Content Standards

2.NBT4; 2.MD6; 6.EE2; 6.NS5

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This activity is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: http://creativecommons.org/licenses/by-nc-sa/3.0/. If you adapt and/or share this activity, you must attribute it to "KCP Technologies, a McGraw-Hill Education Company." You may distribute it only non-commercially under the same or similar license.


This material is based upon work supported by the National Science Foundation under KCP Technologies Award ID 0918733, with grant period September 1, 2009 through August 31, 2013. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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