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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   SkyBlue Box   Violet Box   DodgerBlue Box   Teal Box   Olive Box   Khaki Box   SpringGreen Box   DarkCyan Box   Aquamarine Box   MediumPurple Box   MediumSlateBlue Box  plus     MediumAquamarine Box  equals     SkyBlue Box   Violet Box   DodgerBlue Box   Teal Box   Olive Box   Khaki Box   SpringGreen Box   DarkCyan Box   Aquamarine Box   MediumPurple Box   MediumSlateBlue Box   MediumAquamarine Box

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


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   Indigo Box   Maroon Box   ForestGreen Box   Chocolate Box   DarkSeaGreen Box   Plum Box   Peru Box   SaddleBrown Box   RosyBrown Box   PowderBlue Box   DarkViolet Box  plus     Tan Box   LawnGreen Box  equals     Indigo Box   Maroon Box   ForestGreen Box   Chocolate Box   DarkSeaGreen Box   Plum Box   Peru Box   SaddleBrown Box   RosyBrown Box   PowderBlue Box   DarkViolet Box   Tan Box   LawnGreen Box

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


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   DarkOliveGreen Box   GreenYellow Box   Aqua Box   CadetBlue Box   Magenta Box   Navy Box   Purple Box   DarkGoldenrod Box   MediumSpringGreen Box   Blue Box   SkyBlue Box  plus     Violet Box   DodgerBlue Box   Teal Box  equals     DarkOliveGreen Box   GreenYellow Box   Aqua Box   CadetBlue Box   Magenta Box   Navy Box   Purple Box   DarkGoldenrod Box   MediumSpringGreen Box   Blue Box   SkyBlue Box   Violet Box   DodgerBlue Box   Teal 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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