Teacher2Teacher 
Q&A #9415 
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From: David <purdyd@canby.k12.or.us> To: Teacher2Teacher Public Discussion Date: 2003050719:57:36 Subject: Ellie's question ....since subtracting four is a move of four units to the left on the number line, subtracting a negative four would have to be a move of four units to the right on the number line.
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