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Basic Subtraction Lesson 7: Number 7

Here's an easy example:

8
-
7
=
1
 
                
-
              
=
  
 
   Brown Box   BurlyWood Box   Purple Box   ForestGreen Box   Gold Box   Green Box   DarkOrange Box   SteelBlue Box  minus     Brown Box   BurlyWood Box   Purple Box   ForestGreen Box   Gold Box   Green Box   DarkOrange Box  equals     SteelBlue 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
 
                        
-
              
=
          
 
   Indigo Box   MediumOrchid Box   Goldenrod Box   Pink Box   SkyBlue Box   DeepSkyBlue Box   Tan Box   SandyBrown Box   SlateBlue Box   MediumAquamarine Box   Navy Box   DarkKhaki Box  minus     Indigo Box   MediumOrchid Box   Goldenrod Box   Pink Box   SkyBlue Box   DeepSkyBlue Box   Tan Box  equals     SandyBrown Box   SlateBlue Box   MediumAquamarine Box   Navy Box   DarkKhaki 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
=
 
                                    
-
              
=
                      
 
   Navy Box   DarkKhaki Box   MediumSeaGreen Box   Lavender Box   MediumSlateBlue Box   Sienna Box   DarkSeaGreen Box   Peru Box   Chartreuse Box   LawnGreen Box   MediumBlue Box   LimeGreen Box   HotPink Box   PowderBlue Box   Coral Box   Turquoise Box   MidnightBlue Box   Maroon Box  minus     Navy Box   DarkKhaki Box   MediumSeaGreen Box   Lavender Box   MediumSlateBlue Box   Sienna Box   DarkSeaGreen Box  equals     Peru Box   Chartreuse Box   LawnGreen Box   MediumBlue Box   LimeGreen Box   HotPink Box   PowderBlue Box   Coral Box   Turquoise Box   MidnightBlue Box   Maroon 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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