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					What n The World Is Happening Here?

1. Evaluate the expression   using the given values of n.


a. n = 0              b. n = 5                  c. n = 0.2




d. n = 3.5            e. n =                    f. n = 1




2. For what values of n is       ?




3. Evaluate the expression           using the given values of n.


a. n = 0              b. n = 8                  c. n = 9




d. n =                e. n =                    f. n = 12




4. For what values of n is           defined?
5. Evaluate the expression –          using the given values of n.


a. n =                     b. n = 2                   c. n = 0




d. n = 2.5                 e. n =                     f. n = 1




6. For what values of n is –          always positive?



TEACHER NOTES
Pacing (approximate time without scaffolding)
1 – 2 days for a 50 minute period
1 day for a 90 minute period


Standard(s) Addressed
A1.2.B – Recognize the multiple uses variables, determine all possible values
of variables that satisfy prescribed conditions, and evaluate algebraic
expressions that involve variables.


Scaffolding Ideas
   Give an assignment or activity that reviews the symbols               , and
     .
   Give an assignment or activity that reviews the meanings of natural, whole,
    integer, rational, and real numbers.
   Give an assignment or activity that reviews integer operations.
   Give an assignment or activity that reviews fraction operations.
   Give an assignment or activity that reviews writing compound inequalities.
     Give an assignment or activity that has students practicing using their
      calculators (e.g., using the negative key, parentheses, square roots, and
      entering fractions).
     Explain the meaning of defined.


Answer Key
1a. Undefined
1b.      or 0.2
1c. 5
1d.      or
1e.     or 1.5
1f. 1
2.
3a.           or
3b. 0
3c. undefined
3d. 3
3e. 4
3f. undefined
4.
5a. 3
5b.
5c. 0
5d.
5e.     or 0.6
5f.
6.


Extension Questions
7. For what values of n is           defined?
Answer
7.


8. For what values of n is        defined?




Answer
8.


9. For what values of n is –   always negative?




Answer
9.


10. For what values of n is    always negative?
Answer
10.

				
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