Pre Algebra Subtraction
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Subtraction

 
 Subtracting just means chopping off some of the stuff we have to start:
 
 Example:
 
 Subtract 3 from 9: 
 That just means, start with 9 and take away 3 ...
 

Start with 9

Take Away 3 End up with 6
 
 To say "take away" in math we use this sign:
 

 -

 
 Most of the time, we write subtraction like this:
 
9 - 3 = 6 OR
 
 If all problems were like this, 
 we would be about done with adding and subtracting. 
 They're not. 
 When the numbers get bigger in subtraction, 
 we need some new tricks.
 

   copyright 2005 Bruce Kirkpatrick

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