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Basic Subtraction Lesson 11: Number 11

Here's an easy example:

12
-
11
=
1
 
                        
-
                      
=
  
 
   BlueViolet Box   DarkViolet Box   DodgerBlue Box   MediumSlateBlue Box   Fuchsia Box   DarkSeaGreen Box   DarkTurquoise Box   CadetBlue Box   Teal Box   RoyalBlue Box   DarkOrange Box   HotPink Box  minus     BlueViolet Box   DarkViolet Box   DodgerBlue Box   MediumSlateBlue Box   Fuchsia Box   DarkSeaGreen Box   DarkTurquoise Box   CadetBlue Box   Teal Box   RoyalBlue Box   DarkOrange Box  equals     HotPink Box

We start with twelve boxes, take away eleven boxes, and now have one box. We take away eleven boxes from our twelve boxes to get one box.


Here's another example:

16
-
11
=
5
 
                                
-
                      
=
          
 
   BurlyWood Box   YellowGreen Box   DeepSkyBlue Box   PowderBlue Box   Aquamarine Box   SkyBlue Box   MediumBlue Box   Green Box   Orchid Box   Wheat Box   DarkBlue Box   Blue Box   MediumSeaGreen Box   DarkGoldenrod Box   MediumOrchid Box   Violet Box  minus     BurlyWood Box   YellowGreen Box   DeepSkyBlue Box   PowderBlue Box   Aquamarine Box   SkyBlue Box   MediumBlue Box   Green Box   Orchid Box   Wheat Box   DarkBlue Box  equals     Blue Box   MediumSeaGreen Box   DarkGoldenrod Box   MediumOrchid Box   Violet Box

We start with sixteen boxes, take away eleven boxes, and now have five boxes. We take away eleven boxes from our sixteen boxes to get five boxes.


Try this problem.

19
-
11
=
 
                                      
-
                      
=
                
 
   Yellow Box   Thistle Box   Lavender Box   Magenta Box   Brown Box   Aqua Box   Chartreuse Box   MediumPurple Box   MidnightBlue Box   ForestGreen Box   Purple Box   SteelBlue Box   DarkSlateBlue Box   SeaGreen Box   Indigo Box   DarkCyan Box   Peru Box   DeepPink Box   DarkOrchid Box  minus     Yellow Box   Thistle Box   Lavender Box   Magenta Box   Brown Box   Aqua Box   Chartreuse Box   MediumPurple Box   MidnightBlue Box   ForestGreen Box   Purple Box  equals     SteelBlue Box   DarkSlateBlue Box   SeaGreen Box   Indigo Box   DarkCyan Box   Peru Box   DeepPink Box   DarkOrchid Box

We start with nineteen boxes, take away eleven boxes, and now have eight 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:

11 - 11 =   0
12 - 11 =   1
13 - 11 =   2
14 - 11 =   3
15 - 11 =   4
16 - 11 =   5
17 - 11 =   6
18 - 11 =   7
19 - 11 =   8
20 - 11 =   9
21 - 11 = 10
22 - 11 = 11
23 - 11 = 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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