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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