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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   Orchid Box   DodgerBlue Box   Empty Box   DarkGreen Box   BlueViolet Box   RosyBrown Box   DeepSkyBlue Box   DarkSlateBlue Box   Cyan Box   Teal Box   Goldenrod Box  minus     Orchid Box   DodgerBlue Box   Empty Box   DarkGreen Box   BlueViolet Box   RosyBrown Box   DeepSkyBlue Box   DarkSlateBlue Box   Cyan Box  equals     Teal Box   Goldenrod 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
 
                              
-
                  
=
            
 
   Goldenrod Box   MediumOrchid Box   SaddleBrown Box   Khaki Box   DarkViolet Box   Chocolate Box   MediumBlue Box   LimeGreen Box   Purple Box   SteelBlue Box   Blue Box   ForestGreen Box   MediumTurquoise Box   GreenYellow Box   SpringGreen Box  minus     Goldenrod Box   MediumOrchid Box   SaddleBrown Box   Khaki Box   DarkViolet Box   Chocolate Box   MediumBlue Box   LimeGreen Box   Purple Box  equals     SteelBlue Box   Blue Box   ForestGreen Box   MediumTurquoise Box   GreenYellow Box   SpringGreen 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
=
 
                                          
-
                  
=
                        
 
   Blue Box   ForestGreen Box   MediumTurquoise Box   GreenYellow Box   SpringGreen Box   Brown Box   SeaGreen Box   DarkCyan Box   Plum Box   Aqua Box   Lavender Box   MediumSeaGreen Box   DarkOrchid Box   YellowGreen Box   MediumAquamarine Box   MediumSlateBlue Box   CadetBlue Box   Violet Box   DarkTurquoise Box   Fuchsia Box   BurlyWood Box  minus     Blue Box   ForestGreen Box   MediumTurquoise Box   GreenYellow Box   SpringGreen Box   Brown Box   SeaGreen Box   DarkCyan Box   Plum Box  equals     Aqua Box   Lavender Box   MediumSeaGreen Box   DarkOrchid Box   YellowGreen Box   MediumAquamarine Box   MediumSlateBlue Box   CadetBlue Box   Violet Box   DarkTurquoise Box   Fuchsia Box   BurlyWood 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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