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The following exercise will help you learn the basic subtraction equations for the number 1. When you think you know the equations, please click on the Continue to Next Page link to test your knowledge. Please take your time: take whatever time you need to learn the material.

3
-
1
=
 
 
      
-
  
=
    
 
   Green Box   Peru Box   Lavender Box  minus     Green Box  equals     Green Box   Peru Box

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