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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   Maroon Box   SandyBrown Box   CadetBlue Box   SlateBlue Box   PowderBlue Box   MediumBlue Box   Olive Box   Plum Box   Khaki Box  plus     SteelBlue Box  equals     Maroon Box   SandyBrown Box   CadetBlue Box   SlateBlue Box   PowderBlue Box   MediumBlue Box   Olive Box   Plum Box   Khaki Box   SteelBlue Box

We start with nine boxes, add one box, and now have ten boxes.


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   MediumOrchid Box   Brown Box   RoyalBlue Box   GreenYellow Box   LawnGreen Box   YellowGreen Box   Turquoise Box   DarkOrange Box   OliveDrab Box  plus     SeaGreen Box   Tan Box  equals     MediumOrchid Box   Brown Box   RoyalBlue Box   GreenYellow Box   LawnGreen Box   YellowGreen Box   Turquoise Box   DarkOrange Box   OliveDrab Box   SeaGreen Box   Tan Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   Tan Box   Cyan Box   DarkCyan Box   CornflowerBlue Box   Orchid Box   MediumPurple Box   DarkMagenta Box   SkyBlue Box   DeepSkyBlue Box  plus     Wheat Box   Maroon Box   SandyBrown Box  equals     Tan Box   Cyan Box   DarkCyan Box   CornflowerBlue Box   Orchid Box   MediumPurple Box   DarkMagenta Box   SkyBlue Box   DeepSkyBlue Box   Wheat Box   Maroon Box   SandyBrown Box

We start with nine boxes, add three boxes, and now have twelve 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:

9 + 1 = 10
9 + 2 = 11
9 + 3 = 12
9 + 4 = 13
9 + 5 = 14
9 + 6 = 15
9 + 7 = 16
9 + 8 = 17
9 + 9 = 18
9 + 10 = 19
9 + 11 = 20
9 + 12 = 21


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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