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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   DarkGoldenrod Box   Turquoise Box   LawnGreen Box   MediumAquamarine Box   Tan Box   MediumSlateBlue Box   SaddleBrown Box   LimeGreen Box  minus     DarkGoldenrod Box   Turquoise Box   LawnGreen Box   MediumAquamarine Box   Tan Box   MediumSlateBlue Box   SaddleBrown Box  equals     LimeGreen 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
 
                        
-
              
=
          
 
   DarkTurquoise Box   SeaGreen Box   MediumTurquoise Box   Plum Box   Khaki Box   Olive Box   Peru Box   Blue Box   PowderBlue Box   DeepSkyBlue Box   RoyalBlue Box   Maroon Box  minus     DarkTurquoise Box   SeaGreen Box   MediumTurquoise Box   Plum Box   Khaki Box   Olive Box   Peru Box  equals     Blue Box   PowderBlue Box   DeepSkyBlue Box   RoyalBlue Box   Maroon 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
=
 
                                    
-
              
=
                      
 
   RoyalBlue Box   Maroon Box   SkyBlue Box   Goldenrod Box   MediumSeaGreen Box   SandyBrown Box   Pink Box   OliveDrab Box   Green Box   Aqua Box   DarkSlateBlue Box   Aquamarine Box   YellowGreen Box   SteelBlue Box   BlueViolet Box   Thistle Box   Fuchsia Box   Sienna Box  minus     RoyalBlue Box   Maroon Box   SkyBlue Box   Goldenrod Box   MediumSeaGreen Box   SandyBrown Box   Pink Box  equals     OliveDrab Box   Green Box   Aqua Box   DarkSlateBlue Box   Aquamarine Box   YellowGreen Box   SteelBlue Box   BlueViolet Box   Thistle Box   Fuchsia Box   Sienna 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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