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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   PowderBlue Box   Teal Box   MediumSlateBlue Box   GreenYellow Box   CornflowerBlue Box   DarkCyan Box   Aqua Box   SandyBrown Box   Coral Box   CadetBlue Box   BlueViolet Box  plus     Pink Box  equals     PowderBlue Box   Teal Box   MediumSlateBlue Box   GreenYellow Box   CornflowerBlue Box   DarkCyan Box   Aqua Box   SandyBrown Box   Coral Box   CadetBlue Box   BlueViolet Box   Pink Box

We start with eleven boxes, add one box, and now have twelve boxes.


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   Lavender Box   Indigo Box   MediumSpringGreen Box   DarkOrchid Box   DodgerBlue Box   DeepSkyBlue Box   Plum Box   RoyalBlue Box   OliveDrab Box   Yellow Box   DarkOrange Box  plus     SeaGreen Box   YellowGreen Box  equals     Lavender Box   Indigo Box   MediumSpringGreen Box   DarkOrchid Box   DodgerBlue Box   DeepSkyBlue Box   Plum Box   RoyalBlue Box   OliveDrab Box   Yellow Box   DarkOrange Box   SeaGreen Box   YellowGreen Box

We start with eleven boxes, add two boxes, and now have thirteen boxes.


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   Green Box   Cyan Box   MediumSeaGreen Box   DarkSeaGreen Box   DeepPink Box   Khaki Box   Maroon Box   Goldenrod Box   DarkViolet Box   DarkBlue Box   PowderBlue Box  plus     Teal Box   MediumSlateBlue Box   GreenYellow Box  equals     Green Box   Cyan Box   MediumSeaGreen Box   DarkSeaGreen Box   DeepPink Box   Khaki Box   Maroon Box   Goldenrod Box   DarkViolet Box   DarkBlue Box   PowderBlue Box   Teal Box   MediumSlateBlue Box   GreenYellow Box

We start with eleven boxes, add three boxes, and now have fourteen boxes.


In order to do basic addition, 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 + 1 = 12
11 + 2 = 13
11 + 3 = 14
11 + 4 = 15
11 + 5 = 16
11 + 6 = 17
11 + 7 = 18
11 + 8 = 18
11 + 9 = 10
11 + 10 = 21
11 + 11 = 22
11 + 12 = 23


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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