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Basic Addition Lesson 11: Number 11

Here's an easy example:

11
+
1
=
12
 
                      
+
  
=
                        
 
   HotPink Box   MediumSeaGreen Box   MediumAquamarine Box   Lavender Box   Chocolate Box   DarkMagenta Box   ForestGreen Box   RosyBrown Box   MediumSpringGreen Box   Tan Box   Gold Box  plus     Blue Box  equals     HotPink Box   MediumSeaGreen Box   MediumAquamarine Box   Lavender Box   Chocolate Box   DarkMagenta Box   ForestGreen Box   RosyBrown Box   MediumSpringGreen Box   Tan Box   Gold Box   Blue Box

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


Here's another example:

11
+
2
=
13
 
                      
+
    
=
                          
 
   BlueViolet Box   CornflowerBlue Box   Chartreuse Box   Sienna Box   PowderBlue Box   Turquoise Box   MediumTurquoise Box   Goldenrod Box   Fuchsia Box   SteelBlue Box   DarkOrchid Box  plus     DarkBlue Box   Maroon Box  equals     BlueViolet Box   CornflowerBlue Box   Chartreuse Box   Sienna Box   PowderBlue Box   Turquoise Box   MediumTurquoise Box   Goldenrod Box   Fuchsia Box   SteelBlue Box   DarkOrchid Box   DarkBlue Box   Maroon Box

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


Try this problem.

11
+
3
=
 
                      
+
      
=
                            
 
   MediumSlateBlue Box   Empty Box   DarkGoldenrod Box   Violet Box   SeaGreen Box   Aqua Box   Cyan Box   SlateBlue Box   DarkSlateBlue Box   MidnightBlue Box   HotPink Box  plus     MediumSeaGreen Box   MediumAquamarine Box   Lavender Box  equals     MediumSlateBlue Box   Empty Box   DarkGoldenrod Box   Violet Box   SeaGreen Box   Aqua Box   Cyan Box   SlateBlue Box   DarkSlateBlue Box   MidnightBlue Box   HotPink Box   MediumSeaGreen Box   MediumAquamarine Box   Lavender 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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