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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   MediumPurple Box   Violet Box   Magenta Box   ForestGreen Box   Fuchsia Box   CornflowerBlue Box   DarkGreen Box   DeepPink Box  minus     MediumPurple Box   Violet Box   Magenta Box   ForestGreen Box   Fuchsia Box   CornflowerBlue Box   DarkGreen Box  equals     DeepPink 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
 
                        
-
              
=
          
 
   Cyan Box   Pink Box   RosyBrown Box   MediumSlateBlue Box   DodgerBlue Box   CadetBlue Box   Gold Box   SeaGreen Box   Navy Box   PowderBlue Box   Tan Box   DarkTurquoise Box  minus     Cyan Box   Pink Box   RosyBrown Box   MediumSlateBlue Box   DodgerBlue Box   CadetBlue Box   Gold Box  equals     SeaGreen Box   Navy Box   PowderBlue Box   Tan Box   DarkTurquoise 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
=
 
                                    
-
              
=
                      
 
   Tan Box   DarkTurquoise Box   Green Box   HotPink Box   Maroon Box   DarkSeaGreen Box   LawnGreen Box   SkyBlue Box   Teal Box   Yellow Box   Lavender Box   Aqua Box   BurlyWood Box   Peru Box   Chocolate Box   Olive Box   MediumBlue Box   DarkKhaki Box  minus     Tan Box   DarkTurquoise Box   Green Box   HotPink Box   Maroon Box   DarkSeaGreen Box   LawnGreen Box  equals     SkyBlue Box   Teal Box   Yellow Box   Lavender Box   Aqua Box   BurlyWood Box   Peru Box   Chocolate Box   Olive Box   MediumBlue Box   DarkKhaki 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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