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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   Aqua Box   Aquamarine Box   Coral Box   SlateBlue Box   Green Box   Khaki Box   RoyalBlue Box   MediumPurple Box   BurlyWood Box   DarkOliveGreen Box   DarkSlateBlue Box  plus     LimeGreen Box  equals     Aqua Box   Aquamarine Box   Coral Box   SlateBlue Box   Green Box   Khaki Box   RoyalBlue Box   MediumPurple Box   BurlyWood Box   DarkOliveGreen Box   DarkSlateBlue Box   LimeGreen Box

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


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   DarkMagenta Box   DarkGreen Box   DarkGoldenrod Box   DodgerBlue Box   Yellow Box   DarkBlue Box   ForestGreen Box   Chocolate Box   MediumAquamarine Box   Empty Box   Turquoise Box  plus     SteelBlue Box   Cyan Box  equals     DarkMagenta Box   DarkGreen Box   DarkGoldenrod Box   DodgerBlue Box   Yellow Box   DarkBlue Box   ForestGreen Box   Chocolate Box   MediumAquamarine Box   Empty Box   Turquoise Box   SteelBlue Box   Cyan Box

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


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   Pink Box   Maroon Box   Purple Box   Wheat Box   SkyBlue Box   Magenta Box   Blue Box   Thistle Box   Chartreuse Box   HotPink Box   Aqua Box  plus     Aquamarine Box   Coral Box   SlateBlue Box  equals     Pink Box   Maroon Box   Purple Box   Wheat Box   SkyBlue Box   Magenta Box   Blue Box   Thistle Box   Chartreuse Box   HotPink Box   Aqua Box   Aquamarine Box   Coral Box   SlateBlue 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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