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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   DarkTurquoise Box   Purple Box   Orchid Box   MediumSlateBlue Box   Empty Box   DarkOrchid Box   Plum Box   Brown Box   DarkSlateBlue Box   Pink Box   MediumBlue Box  minus     DarkTurquoise Box   Purple Box   Orchid Box   MediumSlateBlue Box   Empty Box   DarkOrchid Box   Plum Box   Brown Box   DarkSlateBlue Box  equals     Pink Box   MediumBlue 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
 
                              
-
                  
=
            
 
   MediumBlue Box   MediumSeaGreen Box   Tan Box   Chartreuse Box   SandyBrown Box   Violet Box   MediumAquamarine Box   DarkGreen Box   DodgerBlue Box   HotPink Box   Blue Box   Fuchsia Box   Chocolate Box   CadetBlue Box   Goldenrod Box  minus     MediumBlue Box   MediumSeaGreen Box   Tan Box   Chartreuse Box   SandyBrown Box   Violet Box   MediumAquamarine Box   DarkGreen Box   DodgerBlue Box  equals     HotPink Box   Blue Box   Fuchsia Box   Chocolate Box   CadetBlue Box   Goldenrod 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
=
 
                                          
-
                  
=
                        
 
   Blue Box   Fuchsia Box   Chocolate Box   CadetBlue Box   Goldenrod Box   Wheat Box   Indigo Box   Cyan Box   Khaki Box   SkyBlue Box   ForestGreen Box   CornflowerBlue Box   Turquoise Box   DarkViolet Box   DarkSeaGreen Box   PowderBlue Box   Gold Box   DeepPink Box   Olive Box   MidnightBlue Box   Aqua Box  minus     Blue Box   Fuchsia Box   Chocolate Box   CadetBlue Box   Goldenrod Box   Wheat Box   Indigo Box   Cyan Box   Khaki Box  equals     SkyBlue Box   ForestGreen Box   CornflowerBlue Box   Turquoise Box   DarkViolet Box   DarkSeaGreen Box   PowderBlue Box   Gold Box   DeepPink Box   Olive Box   MidnightBlue Box   Aqua 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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