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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   YellowGreen Box   Aquamarine Box   SandyBrown Box   MediumSeaGreen Box   Gold Box   Sienna Box   Coral Box   DeepPink Box  minus     YellowGreen Box   Aquamarine Box   SandyBrown Box   MediumSeaGreen Box   Gold Box   Sienna Box   Coral 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
 
                        
-
              
=
          
 
   SlateBlue Box   LimeGreen Box   Brown Box   Lavender Box   Fuchsia Box   MediumSlateBlue Box   Goldenrod Box   CornflowerBlue Box   Thistle Box   SpringGreen Box   Cyan Box   MediumOrchid Box  minus     SlateBlue Box   LimeGreen Box   Brown Box   Lavender Box   Fuchsia Box   MediumSlateBlue Box   Goldenrod Box  equals     CornflowerBlue Box   Thistle Box   SpringGreen Box   Cyan Box   MediumOrchid 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
=
 
                                    
-
              
=
                      
 
   Cyan Box   MediumOrchid Box   Magenta Box   RoyalBlue Box   SteelBlue Box   DarkViolet Box   LawnGreen Box   Plum Box   MediumAquamarine Box   Chartreuse Box   SeaGreen Box   Maroon Box   DarkSlateBlue Box   ForestGreen Box   HotPink Box   GreenYellow Box   Orchid Box   DarkGoldenrod Box  minus     Cyan Box   MediumOrchid Box   Magenta Box   RoyalBlue Box   SteelBlue Box   DarkViolet Box   LawnGreen Box  equals     Plum Box   MediumAquamarine Box   Chartreuse Box   SeaGreen Box   Maroon Box   DarkSlateBlue Box   ForestGreen Box   HotPink Box   GreenYellow Box   Orchid Box   DarkGoldenrod 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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