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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   MediumSpringGreen Box   DarkSeaGreen Box   SteelBlue Box   DarkOrchid Box   MediumVioletRed Box   SeaGreen Box   DarkGoldenrod Box   Maroon Box   Sienna Box   Fuchsia Box   DarkGreen Box  plus     DarkViolet Box  equals     MediumSpringGreen Box   DarkSeaGreen Box   SteelBlue Box   DarkOrchid Box   MediumVioletRed Box   SeaGreen Box   DarkGoldenrod Box   Maroon Box   Sienna Box   Fuchsia Box   DarkGreen Box   DarkViolet Box

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


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   MediumBlue Box   DarkKhaki Box   Gold Box   Violet Box   DeepPink Box   MediumSeaGreen Box   MediumAquamarine Box   Teal Box   YellowGreen Box   Plum Box   GreenYellow Box  plus     DarkCyan Box   SpringGreen Box  equals     MediumBlue Box   DarkKhaki Box   Gold Box   Violet Box   DeepPink Box   MediumSeaGreen Box   MediumAquamarine Box   Teal Box   YellowGreen Box   Plum Box   GreenYellow Box   DarkCyan Box   SpringGreen Box

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


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   OliveDrab Box   DarkMagenta Box   Blue Box   SlateBlue Box   DarkTurquoise Box   Coral Box   PowderBlue Box   RoyalBlue Box   DarkOrange Box   RosyBrown Box   MediumSpringGreen Box  plus     DarkSeaGreen Box   SteelBlue Box   DarkOrchid Box  equals     OliveDrab Box   DarkMagenta Box   Blue Box   SlateBlue Box   DarkTurquoise Box   Coral Box   PowderBlue Box   RoyalBlue Box   DarkOrange Box   RosyBrown Box   MediumSpringGreen Box   DarkSeaGreen Box   SteelBlue Box   DarkOrchid 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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