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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.

2
-
1
=
 
 
    
-
  
=
  
 
   Plum Box   Yellow Box  minus     Plum Box  equals     Plum Box

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