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Basic Subtraction Lesson 9: Number 9

Here's an easy example:

11
-
9
=
2
 
                      
-
                  
=
    
 
   DarkOliveGreen Box   MediumSpringGreen Box   Blue Box   MediumVioletRed Box   DarkOrange Box   PowderBlue Box   Goldenrod Box   SeaGreen Box   Sienna Box   DarkCyan Box   Tan Box  minus     DarkOliveGreen Box   MediumSpringGreen Box   Blue Box   MediumVioletRed Box   DarkOrange Box   PowderBlue Box   Goldenrod Box   SeaGreen Box   Sienna Box  equals     DarkCyan Box   Tan 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
 
                              
-
                  
=
            
 
   Tan Box   Chartreuse Box   Maroon Box   Lavender Box   DarkTurquoise Box   OliveDrab Box   DarkSlateBlue Box   Pink Box   Brown Box   DodgerBlue Box   MediumBlue Box   Peru Box   Turquoise Box   Wheat Box   YellowGreen Box  minus     Tan Box   Chartreuse Box   Maroon Box   Lavender Box   DarkTurquoise Box   OliveDrab Box   DarkSlateBlue Box   Pink Box   Brown Box  equals     DodgerBlue Box   MediumBlue Box   Peru Box   Turquoise Box   Wheat Box   YellowGreen 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
=
 
                                          
-
                  
=
                        
 
   MediumBlue Box   Peru Box   Turquoise Box   Wheat Box   YellowGreen Box   LawnGreen Box   DarkBlue Box   Empty Box   DarkGoldenrod Box   DarkSeaGreen Box   MediumSeaGreen Box   Cyan Box   Indigo Box   SpringGreen Box   GreenYellow Box   MediumTurquoise Box   Green Box   DarkMagenta Box   SteelBlue Box   HotPink Box   RoyalBlue Box  minus     MediumBlue Box   Peru Box   Turquoise Box   Wheat Box   YellowGreen Box   LawnGreen Box   DarkBlue Box   Empty Box   DarkGoldenrod Box  equals     DarkSeaGreen Box   MediumSeaGreen Box   Cyan Box   Indigo Box   SpringGreen Box   GreenYellow Box   MediumTurquoise Box   Green Box   DarkMagenta Box   SteelBlue Box   HotPink Box   RoyalBlue 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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