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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   Green Box   RosyBrown Box   Maroon Box   HotPink Box   Olive Box   Teal Box   YellowGreen Box   DarkOliveGreen Box   MediumSeaGreen Box   Yellow Box   SteelBlue Box  minus     Green Box   RosyBrown Box   Maroon Box   HotPink Box   Olive Box   Teal Box   YellowGreen Box   DarkOliveGreen Box   MediumSeaGreen Box  equals     Yellow Box   SteelBlue 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
 
                              
-
                  
=
            
 
   SteelBlue Box   DarkCyan Box   Aqua Box   Empty Box   BlueViolet Box   RoyalBlue Box   Violet Box   CornflowerBlue Box   Plum Box   MediumOrchid Box   DarkGreen Box   DarkSeaGreen Box   DarkOrange Box   Turquoise Box   Thistle Box  minus     SteelBlue Box   DarkCyan Box   Aqua Box   Empty Box   BlueViolet Box   RoyalBlue Box   Violet Box   CornflowerBlue Box   Plum Box  equals     MediumOrchid Box   DarkGreen Box   DarkSeaGreen Box   DarkOrange Box   Turquoise Box   Thistle 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
=
 
                                          
-
                  
=
                        
 
   DarkGreen Box   DarkSeaGreen Box   DarkOrange Box   Turquoise Box   Thistle Box   Khaki Box   Indigo Box   Sienna Box   Goldenrod Box   SandyBrown Box   Pink Box   SpringGreen Box   Coral Box   MediumTurquoise Box   Blue Box   LimeGreen Box   MediumSpringGreen Box   PowderBlue Box   SkyBlue Box   BurlyWood Box   DeepSkyBlue Box  minus     DarkGreen Box   DarkSeaGreen Box   DarkOrange Box   Turquoise Box   Thistle Box   Khaki Box   Indigo Box   Sienna Box   Goldenrod Box  equals     SandyBrown Box   Pink Box   SpringGreen Box   Coral Box   MediumTurquoise Box   Blue Box   LimeGreen Box   MediumSpringGreen Box   PowderBlue Box   SkyBlue Box   BurlyWood Box   DeepSkyBlue 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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