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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   Peru Box   Orchid Box   Aquamarine Box   Pink Box   BlueViolet Box   Goldenrod Box   Chartreuse Box   Indigo Box   SpringGreen Box   Sienna Box   YellowGreen Box  minus     Peru Box   Orchid Box   Aquamarine Box   Pink Box   BlueViolet Box   Goldenrod Box   Chartreuse Box   Indigo Box   SpringGreen Box  equals     Sienna Box   YellowGreen 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
 
                              
-
                  
=
            
 
   YellowGreen Box   MediumPurple Box   DarkGoldenrod Box   DarkCyan Box   Wheat Box   ForestGreen Box   SeaGreen Box   Magenta Box   SandyBrown Box   DarkSeaGreen Box   MediumSlateBlue Box   MediumVioletRed Box   Lavender Box   BurlyWood Box   Blue Box  minus     YellowGreen Box   MediumPurple Box   DarkGoldenrod Box   DarkCyan Box   Wheat Box   ForestGreen Box   SeaGreen Box   Magenta Box   SandyBrown Box  equals     DarkSeaGreen Box   MediumSlateBlue Box   MediumVioletRed Box   Lavender Box   BurlyWood Box   Blue 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
=
 
                                          
-
                  
=
                        
 
   MediumSlateBlue Box   MediumVioletRed Box   Lavender Box   BurlyWood Box   Blue Box   GreenYellow Box   MediumOrchid Box   Aqua Box   Purple Box   Tan Box   Turquoise Box   SteelBlue Box   OliveDrab Box   DeepPink Box   RosyBrown Box   Empty Box   Plum Box   Maroon Box   DarkBlue Box   Cyan Box   Teal Box  minus     MediumSlateBlue Box   MediumVioletRed Box   Lavender Box   BurlyWood Box   Blue Box   GreenYellow Box   MediumOrchid Box   Aqua Box   Purple Box  equals     Tan Box   Turquoise Box   SteelBlue Box   OliveDrab Box   DeepPink Box   RosyBrown Box   Empty Box   Plum Box   Maroon Box   DarkBlue Box   Cyan Box   Teal 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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