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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   Tan Box   MediumOrchid Box   Aquamarine Box   MediumSpringGreen Box   Blue Box   Aqua Box   MediumAquamarine Box   CornflowerBlue Box   DeepSkyBlue Box  plus     MediumSeaGreen Box  equals     Tan Box   MediumOrchid Box   Aquamarine Box   MediumSpringGreen Box   Blue Box   Aqua Box   MediumAquamarine Box   CornflowerBlue Box   DeepSkyBlue Box   MediumSeaGreen Box

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


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   Empty Box   BlueViolet Box   SkyBlue Box   Plum Box   DarkGreen Box   Navy Box   SeaGreen Box   RoyalBlue Box   Sienna Box  plus     HotPink Box   DarkGoldenrod Box  equals     Empty Box   BlueViolet Box   SkyBlue Box   Plum Box   DarkGreen Box   Navy Box   SeaGreen Box   RoyalBlue Box   Sienna Box   HotPink Box   DarkGoldenrod Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   DarkGoldenrod Box   DarkTurquoise Box   DarkSlateBlue Box   Yellow Box   DodgerBlue Box   DarkOliveGreen Box   PowderBlue Box   Chocolate Box   Goldenrod Box  plus     MediumVioletRed Box   Tan Box   MediumOrchid Box  equals     DarkGoldenrod Box   DarkTurquoise Box   DarkSlateBlue Box   Yellow Box   DodgerBlue Box   DarkOliveGreen Box   PowderBlue Box   Chocolate Box   Goldenrod Box   MediumVioletRed Box   Tan Box   MediumOrchid 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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