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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.

12
-
1
=
 
 
                        
-
  
=
                      
 
   DodgerBlue Box   Chartreuse Box   DarkOliveGreen Box   SeaGreen Box   Empty Box   Navy Box   MediumSeaGreen Box   DarkSeaGreen Box   Brown Box   Orchid Box   PowderBlue Box   Wheat Box  minus     DodgerBlue Box  equals     DodgerBlue Box   Chartreuse Box   DarkOliveGreen Box   SeaGreen Box   Empty Box   Navy Box   MediumSeaGreen Box   DarkSeaGreen Box   Brown Box   Orchid Box   PowderBlue Box

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