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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   Empty Box   Magenta Box   BurlyWood Box   RoyalBlue Box   CornflowerBlue Box   Olive Box   DarkMagenta Box   Purple Box  minus     Empty Box   Magenta Box   BurlyWood Box   RoyalBlue Box   CornflowerBlue Box   Olive Box   DarkMagenta Box  equals     Purple Box

We start with eight boxes, take away seven boxes, and now have one box. We take away seven boxes from our eight boxes to get one box.


Here's another example:

12
-
7
=
5
 
                        
-
              
=
          
 
   BlueViolet Box   YellowGreen Box   SlateBlue Box   DarkSeaGreen Box   DarkOrchid Box   DeepPink Box   CadetBlue Box   MediumSpringGreen Box   MediumVioletRed Box   DarkBlue Box   SkyBlue Box   Chocolate Box  minus     BlueViolet Box   YellowGreen Box   SlateBlue Box   DarkSeaGreen Box   DarkOrchid Box   DeepPink Box   CadetBlue Box  equals     MediumSpringGreen Box   MediumVioletRed Box   DarkBlue Box   SkyBlue Box   Chocolate Box

We start with twelve boxes, take away seven boxes, and now have five boxes. We take away seven boxes from our twelve boxes to get five boxes.


Try this problem.

18
-
7
=
 
                                    
-
              
=
                      
 
   SkyBlue Box   Chocolate Box   DarkKhaki Box   LawnGreen Box   Aquamarine Box   Lavender Box   MediumOrchid Box   Cyan Box   MidnightBlue Box   Fuchsia Box   DarkGoldenrod Box   SandyBrown Box   SaddleBrown Box   SeaGreen Box   MediumPurple Box   Navy Box   MediumSeaGreen Box   DarkGreen Box  minus     SkyBlue Box   Chocolate Box   DarkKhaki Box   LawnGreen Box   Aquamarine Box   Lavender Box   MediumOrchid Box  equals     Cyan Box   MidnightBlue Box   Fuchsia Box   DarkGoldenrod Box   SandyBrown Box   SaddleBrown Box   SeaGreen Box   MediumPurple Box   Navy Box   MediumSeaGreen Box   DarkGreen Box

We start with eighteen boxes, take away seven boxes, and now have eleven boxes.


In order to do basic subtraction, 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:

  7 - 7 =   0
  8 - 7 =   1
  9 - 7 =   2
10 - 7 =   3
11 - 7 =   4
12 - 7 =   5
13 - 7 =   6
14 - 7 =   7
15 - 7 =   8
16 - 7 =   9
17 - 7 = 10
18 - 7 = 11
19 - 7 = 12


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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