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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   SteelBlue Box   Indigo Box   Yellow Box   SeaGreen Box   DodgerBlue Box   MediumPurple Box   DarkOrchid Box   HotPink Box   MediumSeaGreen Box   Wheat Box   Lavender Box  plus     DarkMagenta Box  equals     SteelBlue Box   Indigo Box   Yellow Box   SeaGreen Box   DodgerBlue Box   MediumPurple Box   DarkOrchid Box   HotPink Box   MediumSeaGreen Box   Wheat Box   Lavender Box   DarkMagenta Box

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


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   Olive Box   Coral Box   SaddleBrown Box   Blue Box   DarkOrange Box   MidnightBlue Box   Fuchsia Box   DarkBlue Box   Peru Box   DarkGoldenrod Box   DarkOliveGreen Box  plus     Empty Box   Plum Box  equals     Olive Box   Coral Box   SaddleBrown Box   Blue Box   DarkOrange Box   MidnightBlue Box   Fuchsia Box   DarkBlue Box   Peru Box   DarkGoldenrod Box   DarkOliveGreen Box   Empty Box   Plum Box

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


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   DarkSlateBlue Box   MediumVioletRed Box   RoyalBlue Box   BlueViolet Box   SandyBrown Box   Orchid Box   Gold Box   Aqua Box   Thistle Box   LawnGreen Box   SteelBlue Box  plus     Indigo Box   Yellow Box   SeaGreen Box  equals     DarkSlateBlue Box   MediumVioletRed Box   RoyalBlue Box   BlueViolet Box   SandyBrown Box   Orchid Box   Gold Box   Aqua Box   Thistle Box   LawnGreen Box   SteelBlue Box   Indigo Box   Yellow Box   SeaGreen 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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