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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   SaddleBrown Box   HotPink Box   DarkTurquoise Box   SteelBlue Box   DodgerBlue Box   Fuchsia Box   MediumOrchid Box   DeepSkyBlue Box  minus     SaddleBrown Box   HotPink Box   DarkTurquoise Box   SteelBlue Box   DodgerBlue Box   Fuchsia Box   MediumOrchid Box  equals     DeepSkyBlue 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
 
                        
-
              
=
          
 
   OliveDrab Box   DarkSeaGreen Box   DeepPink Box   Goldenrod Box   Gold Box   Magenta Box   Chocolate Box   ForestGreen Box   Maroon Box   RoyalBlue Box   SpringGreen Box   Brown Box  minus     OliveDrab Box   DarkSeaGreen Box   DeepPink Box   Goldenrod Box   Gold Box   Magenta Box   Chocolate Box  equals     ForestGreen Box   Maroon Box   RoyalBlue Box   SpringGreen Box   Brown 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
=
 
                                    
-
              
=
                      
 
   SpringGreen Box   Brown Box   Wheat Box   MidnightBlue Box   Peru Box   Teal Box   DarkOliveGreen Box   Purple Box   BlueViolet Box   SandyBrown Box   CadetBlue Box   SlateBlue Box   Turquoise Box   Tan Box   Thistle Box   Sienna Box   MediumTurquoise Box   CornflowerBlue Box  minus     SpringGreen Box   Brown Box   Wheat Box   MidnightBlue Box   Peru Box   Teal Box   DarkOliveGreen Box  equals     Purple Box   BlueViolet Box   SandyBrown Box   CadetBlue Box   SlateBlue Box   Turquoise Box   Tan Box   Thistle Box   Sienna Box   MediumTurquoise Box   CornflowerBlue 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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