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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   Turquoise Box   MediumPurple Box   MediumAquamarine Box   Pink Box   Yellow Box   Maroon Box   Thistle Box   PowderBlue Box   SaddleBrown Box   SteelBlue Box   DarkBlue Box  minus     Turquoise Box   MediumPurple Box   MediumAquamarine Box   Pink Box   Yellow Box   Maroon Box   Thistle Box   PowderBlue Box   SaddleBrown Box  equals     SteelBlue Box   DarkBlue Box

We start with eleven boxes, take away nine boxes, and now have two boxes. We take away nine boxes from our eleven boxes to get two boxes.


Here's another example:

15
-
9
=
6
 
                              
-
                  
=
            
 
   DarkBlue Box   DarkMagenta Box   Empty Box   DodgerBlue Box   Green Box   RosyBrown Box   GreenYellow Box   OliveDrab Box   MediumSlateBlue Box   MidnightBlue Box   DeepSkyBlue Box   YellowGreen Box   SeaGreen Box   ForestGreen Box   Navy Box  minus     DarkBlue Box   DarkMagenta Box   Empty Box   DodgerBlue Box   Green Box   RosyBrown Box   GreenYellow Box   OliveDrab Box   MediumSlateBlue Box  equals     MidnightBlue Box   DeepSkyBlue Box   YellowGreen Box   SeaGreen Box   ForestGreen Box   Navy Box

We start with fifteen boxes, take away nine boxes, and now have six boxes. We take away nine boxes from our fifteen boxes to get six boxes.


Try this problem.

21
-
9
=
 
                                          
-
                  
=
                        
 
   DeepSkyBlue Box   YellowGreen Box   SeaGreen Box   ForestGreen Box   Navy Box   MediumSeaGreen Box   DarkOliveGreen Box   Purple Box   CornflowerBlue Box   MediumTurquoise Box   Lavender Box   Aqua Box   DarkTurquoise Box   Chocolate Box   Tan Box   DarkSeaGreen Box   Fuchsia Box   Aquamarine Box   Plum Box   HotPink Box   SandyBrown Box  minus     DeepSkyBlue Box   YellowGreen Box   SeaGreen Box   ForestGreen Box   Navy Box   MediumSeaGreen Box   DarkOliveGreen Box   Purple Box   CornflowerBlue Box  equals     MediumTurquoise Box   Lavender Box   Aqua Box   DarkTurquoise Box   Chocolate Box   Tan Box   DarkSeaGreen Box   Fuchsia Box   Aquamarine Box   Plum Box   HotPink Box   SandyBrown Box

We start with twenty-one boxes, take away nine boxes, and now have twelve boxes.


In order to do basic subtraction, you must memorize some equations but fear not: FoxyMath will help you! When you are finished with this lesson, you will know the following equations:

  9 - 9 =   0
10 - 9 =   1
11 - 9 =   2
12 - 9 =   3
13 - 9 =   4
14 - 9 =   5
15 - 9 =   6
16 - 9 =   7
17 - 9 =   8
18 - 9 =   9
19 - 9 = 10
20 - 9 = 11
21 - 9 = 12


The following exercise will help you learn the above equations and what they mean. Please take your time: take whatever time you need to learn the material.

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