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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   LawnGreen Box   MediumPurple Box   Yellow Box   Fuchsia Box   Maroon Box   Chocolate Box   MediumAquamarine Box   SlateBlue Box   Goldenrod Box   Teal Box   Coral Box  minus     LawnGreen Box   MediumPurple Box   Yellow Box   Fuchsia Box   Maroon Box   Chocolate Box   MediumAquamarine Box   SlateBlue Box   Goldenrod Box  equals     Teal Box   Coral 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
 
                              
-
                  
=
            
 
   Coral Box   Blue Box   DarkTurquoise Box   DarkMagenta Box   Sienna Box   Indigo Box   DarkOrange Box   MediumOrchid Box   Tan Box   Aquamarine Box   RosyBrown Box   MediumBlue Box   Chartreuse Box   MediumSeaGreen Box   OliveDrab Box  minus     Coral Box   Blue Box   DarkTurquoise Box   DarkMagenta Box   Sienna Box   Indigo Box   DarkOrange Box   MediumOrchid Box   Tan Box  equals     Aquamarine Box   RosyBrown Box   MediumBlue Box   Chartreuse Box   MediumSeaGreen Box   OliveDrab 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
=
 
                                          
-
                  
=
                        
 
   RosyBrown Box   MediumBlue Box   Chartreuse Box   MediumSeaGreen Box   OliveDrab Box   MediumVioletRed Box   Lavender Box   DarkKhaki Box   YellowGreen Box   DarkBlue Box   SteelBlue Box   MediumTurquoise Box   HotPink Box   BurlyWood Box   DarkGoldenrod Box   Olive Box   ForestGreen Box   Magenta Box   Empty Box   GreenYellow Box   Pink Box  minus     RosyBrown Box   MediumBlue Box   Chartreuse Box   MediumSeaGreen Box   OliveDrab Box   MediumVioletRed Box   Lavender Box   DarkKhaki Box   YellowGreen Box  equals     DarkBlue Box   SteelBlue Box   MediumTurquoise Box   HotPink Box   BurlyWood Box   DarkGoldenrod Box   Olive Box   ForestGreen Box   Magenta Box   Empty Box   GreenYellow Box   Pink 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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