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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   OliveDrab Box   LawnGreen Box   SeaGreen Box   DarkOliveGreen Box   MediumVioletRed Box   DarkOrange Box   Fuchsia Box   Tan Box   DarkSeaGreen Box   SteelBlue Box   LimeGreen Box  minus     OliveDrab Box   LawnGreen Box   SeaGreen Box   DarkOliveGreen Box   MediumVioletRed Box   DarkOrange Box   Fuchsia Box   Tan Box   DarkSeaGreen Box  equals     SteelBlue Box   LimeGreen 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
 
                              
-
                  
=
            
 
   LimeGreen Box   BlueViolet Box   SpringGreen Box   Brown Box   Empty Box   SlateBlue Box   Thistle Box   CadetBlue Box   Coral Box   RosyBrown Box   Violet Box   Teal Box   MediumSeaGreen Box   DeepPink Box   RoyalBlue Box  minus     LimeGreen Box   BlueViolet Box   SpringGreen Box   Brown Box   Empty Box   SlateBlue Box   Thistle Box   CadetBlue Box   Coral Box  equals     RosyBrown Box   Violet Box   Teal Box   MediumSeaGreen Box   DeepPink Box   RoyalBlue 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
=
 
                                          
-
                  
=
                        
 
   Violet Box   Teal Box   MediumSeaGreen Box   DeepPink Box   RoyalBlue Box   MediumSlateBlue Box   DarkGoldenrod Box   DarkCyan Box   DarkMagenta Box   YellowGreen Box   Lavender Box   Plum Box   Aqua Box   Yellow Box   MediumPurple Box   MediumOrchid Box   DodgerBlue Box   Chocolate Box   MediumSpringGreen Box   DarkSlateBlue Box   Purple Box  minus     Violet Box   Teal Box   MediumSeaGreen Box   DeepPink Box   RoyalBlue Box   MediumSlateBlue Box   DarkGoldenrod Box   DarkCyan Box   DarkMagenta Box  equals     YellowGreen Box   Lavender Box   Plum Box   Aqua Box   Yellow Box   MediumPurple Box   MediumOrchid Box   DodgerBlue Box   Chocolate Box   MediumSpringGreen Box   DarkSlateBlue Box   Purple 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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