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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   CadetBlue Box   Tan Box   Aquamarine Box   CornflowerBlue Box   SaddleBrown Box   SeaGreen Box   Plum Box   MediumAquamarine Box   Magenta Box  plus     Khaki Box  equals     CadetBlue Box   Tan Box   Aquamarine Box   CornflowerBlue Box   SaddleBrown Box   SeaGreen Box   Plum Box   MediumAquamarine Box   Magenta Box   Khaki Box

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


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   LimeGreen Box   SlateBlue Box   SkyBlue Box   Aqua Box   Yellow Box   Violet Box   DodgerBlue Box   Thistle Box   Chartreuse Box  plus     OliveDrab Box   SpringGreen Box  equals     LimeGreen Box   SlateBlue Box   SkyBlue Box   Aqua Box   Yellow Box   Violet Box   DodgerBlue Box   Thistle Box   Chartreuse Box   OliveDrab Box   SpringGreen Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   SpringGreen Box   Brown Box   Sienna Box   BurlyWood Box   DarkOrchid Box   DarkGoldenrod Box   LawnGreen Box   Turquoise Box   DarkCyan Box  plus     DarkBlue Box   CadetBlue Box   Tan Box  equals     SpringGreen Box   Brown Box   Sienna Box   BurlyWood Box   DarkOrchid Box   DarkGoldenrod Box   LawnGreen Box   Turquoise Box   DarkCyan Box   DarkBlue Box   CadetBlue Box   Tan 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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