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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   Sienna Box   Green Box   Chocolate Box   Indigo Box   MediumTurquoise Box   MediumSlateBlue Box   MediumAquamarine Box   YellowGreen Box   Tan Box  plus     Plum Box  equals     Sienna Box   Green Box   Chocolate Box   Indigo Box   MediumTurquoise Box   MediumSlateBlue Box   MediumAquamarine Box   YellowGreen Box   Tan Box   Plum Box

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


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   SteelBlue Box   SpringGreen Box   OliveDrab Box   CornflowerBlue Box   DeepSkyBlue Box   CadetBlue Box   DodgerBlue Box   DarkOrange Box   DeepPink Box  plus     DarkOliveGreen Box   LimeGreen Box  equals     SteelBlue Box   SpringGreen Box   OliveDrab Box   CornflowerBlue Box   DeepSkyBlue Box   CadetBlue Box   DodgerBlue Box   DarkOrange Box   DeepPink Box   DarkOliveGreen Box   LimeGreen Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   LimeGreen Box   Olive Box   RoyalBlue Box   SaddleBrown Box   Aqua Box   PowderBlue Box   Teal Box   BlueViolet Box   Violet Box  plus     DarkTurquoise Box   Sienna Box   Green Box  equals     LimeGreen Box   Olive Box   RoyalBlue Box   SaddleBrown Box   Aqua Box   PowderBlue Box   Teal Box   BlueViolet Box   Violet Box   DarkTurquoise Box   Sienna Box   Green 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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