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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   Pink Box   Plum Box   DarkTurquoise Box   DeepPink Box   Olive Box   Orchid Box   MediumSeaGreen Box   DeepSkyBlue Box   SkyBlue Box  plus     HotPink Box  equals     Pink Box   Plum Box   DarkTurquoise Box   DeepPink Box   Olive Box   Orchid Box   MediumSeaGreen Box   DeepSkyBlue Box   SkyBlue Box   HotPink Box

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


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   MediumPurple Box   DarkViolet Box   DarkSlateBlue Box   Thistle Box   RoyalBlue Box   MediumOrchid Box   DarkGreen Box   ForestGreen Box   GreenYellow Box  plus     Empty Box   SteelBlue Box  equals     MediumPurple Box   DarkViolet Box   DarkSlateBlue Box   Thistle Box   RoyalBlue Box   MediumOrchid Box   DarkGreen Box   ForestGreen Box   GreenYellow Box   Empty Box   SteelBlue Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   SteelBlue Box   DarkMagenta Box   Aquamarine Box   LawnGreen Box   MediumTurquoise Box   BurlyWood Box   Lavender Box   Cyan Box   Magenta Box  plus     Chartreuse Box   Pink Box   Plum Box  equals     SteelBlue Box   DarkMagenta Box   Aquamarine Box   LawnGreen Box   MediumTurquoise Box   BurlyWood Box   Lavender Box   Cyan Box   Magenta Box   Chartreuse Box   Pink Box   Plum 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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