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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   MediumSeaGreen Box   HotPink Box   MediumOrchid Box   LawnGreen Box   Olive Box   OliveDrab Box   Aqua Box   DarkGreen Box   DeepPink Box   MediumBlue Box   SpringGreen Box  minus     MediumSeaGreen Box   HotPink Box   MediumOrchid Box   LawnGreen Box   Olive Box   OliveDrab Box   Aqua Box   DarkGreen Box   DeepPink Box  equals     MediumBlue Box   SpringGreen 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
 
                              
-
                  
=
            
 
   SpringGreen Box   Tan Box   Thistle Box   Peru Box   SteelBlue Box   Green Box   Khaki Box   LimeGreen Box   Brown Box   RosyBrown Box   DarkViolet Box   DarkSlateBlue Box   Orchid Box   Empty Box   Fuchsia Box  minus     SpringGreen Box   Tan Box   Thistle Box   Peru Box   SteelBlue Box   Green Box   Khaki Box   LimeGreen Box   Brown Box  equals     RosyBrown Box   DarkViolet Box   DarkSlateBlue Box   Orchid Box   Empty Box   Fuchsia 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
=
 
                                          
-
                  
=
                        
 
   DarkViolet Box   DarkSlateBlue Box   Orchid Box   Empty Box   Fuchsia Box   Magenta Box   DarkOrchid Box   Aquamarine Box   CadetBlue Box   Chocolate Box   SandyBrown Box   Chartreuse Box   Pink Box   GreenYellow Box   MediumSlateBlue Box   SlateBlue Box   DarkCyan Box   DodgerBlue Box   Yellow Box   BurlyWood Box   SkyBlue Box  minus     DarkViolet Box   DarkSlateBlue Box   Orchid Box   Empty Box   Fuchsia Box   Magenta Box   DarkOrchid Box   Aquamarine Box   CadetBlue Box  equals     Chocolate Box   SandyBrown Box   Chartreuse Box   Pink Box   GreenYellow Box   MediumSlateBlue Box   SlateBlue Box   DarkCyan Box   DodgerBlue Box   Yellow Box   BurlyWood Box   SkyBlue 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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