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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   Navy Box   MediumOrchid Box   Turquoise Box   MediumVioletRed Box   SlateBlue Box   SpringGreen Box   MediumPurple Box   Wheat Box  minus     Navy Box   MediumOrchid Box   Turquoise Box   MediumVioletRed Box   SlateBlue Box   SpringGreen Box   MediumPurple Box  equals     Wheat 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
 
                        
-
              
=
          
 
   Chocolate Box   DarkMagenta Box   DarkGoldenrod Box   Purple Box   Lavender Box   Maroon Box   Tan Box   Aquamarine Box   DarkOrange Box   BlueViolet Box   RosyBrown Box   Khaki Box  minus     Chocolate Box   DarkMagenta Box   DarkGoldenrod Box   Purple Box   Lavender Box   Maroon Box   Tan Box  equals     Aquamarine Box   DarkOrange Box   BlueViolet Box   RosyBrown Box   Khaki 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
=
 
                                    
-
              
=
                      
 
   RosyBrown Box   Khaki Box   Aqua Box   Blue Box   MediumAquamarine Box   Brown Box   Orchid Box   SaddleBrown Box   MidnightBlue Box   Cyan Box   Teal Box   Goldenrod Box   Plum Box   DarkSeaGreen Box   SandyBrown Box   BurlyWood Box   DarkBlue Box   SkyBlue Box  minus     RosyBrown Box   Khaki Box   Aqua Box   Blue Box   MediumAquamarine Box   Brown Box   Orchid Box  equals     SaddleBrown Box   MidnightBlue Box   Cyan Box   Teal Box   Goldenrod Box   Plum Box   DarkSeaGreen Box   SandyBrown Box   BurlyWood Box   DarkBlue Box   SkyBlue 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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