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Basic Addition Lesson 9: Number 9

Here's an easy example:

9
+
1
=
10
 
                  
+
  
=
                    
 
   OliveDrab Box   Thistle Box   DarkSlateBlue Box   MediumPurple Box   Peru Box   Chocolate Box   Chartreuse Box   Indigo Box   DarkKhaki Box  plus     LawnGreen Box  equals     OliveDrab Box   Thistle Box   DarkSlateBlue Box   MediumPurple Box   Peru Box   Chocolate Box   Chartreuse Box   Indigo Box   DarkKhaki Box   LawnGreen Box

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


Here's another example:

9
+
2
=
11
 
                  
+
    
=
                      
 
   Teal Box   Cyan Box   SkyBlue Box   DarkViolet Box   SlateBlue Box   Yellow Box   CadetBlue Box   GreenYellow Box   DarkOrange Box  plus     DarkGreen Box   RosyBrown Box  equals     Teal Box   Cyan Box   SkyBlue Box   DarkViolet Box   SlateBlue Box   Yellow Box   CadetBlue Box   GreenYellow Box   DarkOrange Box   DarkGreen Box   RosyBrown Box

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


Try this problem.

9
+
3
=
 
                  
+
      
=
                        
 
   RosyBrown Box   MediumTurquoise Box   MediumSlateBlue Box   Turquoise Box   MediumSpringGreen Box   SandyBrown Box   Goldenrod Box   BurlyWood Box   SteelBlue Box  plus     Empty Box   OliveDrab Box   Thistle Box  equals     RosyBrown Box   MediumTurquoise Box   MediumSlateBlue Box   Turquoise Box   MediumSpringGreen Box   SandyBrown Box   Goldenrod Box   BurlyWood Box   SteelBlue Box   Empty Box   OliveDrab Box   Thistle 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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