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Use after students solved numerous addition, subtraction, multiplication, and division problems:Determine whether each of the following is always, sometimes, or never true.If m and n are positive rational numbers, then m+n is positive. IIf m and n are negative rational numbers, then m +n is negative.If m is a positive rational number and n is a negative rational number, then m+n is negative.If m and n are positive rational numbers, then mxn is positive.If m and n are negative rational numbers, then mxn is negative.

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Cheyenne, these are the answers to these questions:

• Positive + Positive : then m+n is positive ,always

,

• Negative + Negative: then m+n is negative ,always

,

• Positive + Negative: then m+n is negative ,sometimes

,

• Positive * Positive : then m * n is positive, always

,

• Negative * Negative: then m * n is negative ,never

Cheyenne, this is really important you keep in mind:

"Two like signs make a positive sign,

two unlike signs make a negative sign"

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