แบบฝึกการบวกเรียงจำนวน

1. 100..........800                 แทนค่า  (ต+ป)*ท/2     
วิธีทำ  สูตร =  (ต+ป)*ท/2          = (100+800)*701/2            
              ต =  100                     =  (900*701)/2
              ป =  800                     =  630,900/2   
              ท =  (ป-ต+1)              =  315,450
                 =800-100+1
                 =701
 2.  200.........1,200            
วิธีทำ  สูตร = (ต+ป)*ท/2      แทนค่า  (ต+ป)*ท/2
               ต = 200                     = (200+1,200)*1,001/2
               ป = 800                     = (1,400*1,001)/2 
               ท = (ป-ต)*ท/2           = 1,401,400/2 
                  = 1,200-200+1       = 700,700
                  = 1,001
     

300.......700     
สูตร   [ต+ป]*ท/2
         ต = 300
         ป = 700
         ท = [ป-ต+1] = 700-300+1=401
     แท่นค่า   
      [ต+ป]*ท
   =[300+700]*401/2
   =210,000*401/2
   =15,000*401  
   =6,015,000
 250.......550
สูตร  [ต+ป]*ท/2
        ต=250
        ป=550
        ท=[ป-ต+1]=550-250+1=301
    แท่นค่า
     [ต+ป]*ท
    =[250+550]*301/2
   =6,015,000*301/2 
   =3,007,500*301     
   =908,257,500              

1.  500 ......900                                   เเทนค่า               
วิธีทํา  สูตร=(ต+ป)*ท/2                         (ต+ป)*ท/2
          ต=500                                         =(500+900)*401/2
          ป=900                                         =(1,400*401)/2
          ท=(ป-ต+1)=900-500+1=401     =561,400/2  
                                                             =280,700

2.  111.....999                                       เเทนค่า
วิธีทํา  สูตร=(ต+ป)*ท/2                          (ต+ป)*ท/2
          ต=111                                         =(111+999)*889/2
          ป=999                                         =(1,110*889)/2
          ท=(ป-ต+1)=999-111+1=889     =986,790/2
                                                             =493,395

1. 222. . .888                                                                     
วิธีทำ    สูตร =(ต+ป)*ท/2
            ต=222
            ป=888
            ท=(ป-ต+1=888222+1=667                             
      แทนค่า
             (ต+ป)*ท/2
         =(222+888)*667/2
         =1,110*667/2
         =555*667 
        =370185                                                                                                                                                                                                                                                                                      

300.......700     
สูตร   [ต+ป]*ท/2
         ต = 300
         ป = 700
         ท = [ป-ต+1] = 700-300+1=401
     แท่นค่า   
      [ต+ป]*ท/2
   =[300+700]*401/2
   =210,000*401/2
   =15,000*401  
   =6,015,000
 250.......550
สูตร  [ต+ป]*ท/2
        ต=250
        ป=550
        ท=[ป-ต+1]=550-250+1=301
    แท่นค่า
     [ต+ป]*ท/2
    =[250+550]*301/2
   =6,015,000*301/2 
   =3,007,500*301     
   =908,257,500              

1. 222.....888
วิธีทำ   สูตร   =(ต+ป)*ท/2
                 ต=222
                 ป=888
                  ท=(ป-ต+1)=888-222+1=667
             แทนค่า
              =(ต+ป)*ท/2
              =(222*888)*15
              =1,110*667
                       2
              =555*667
             =370,185

 

 

300.......700     
สูตร   [ต+ป]*ท/2
         ต = 300
         ป = 700
         ท = [ป-ต+1] = 700-300+1=401
     แท่นค่า   
      [ต+ป]*ท/2
   =[300+700]*401/2
   =210,000*401/2
   =15,000*401  
   =6,015,000
 250.......550
สูตร  [ต+ป]*ท/2
        ต=250
        ป=550
        ท=[ป-ต+1]=550-250+1=301
    แท่นค่า
     [ต+ป]*ท/2
    =[250+550]*301/2
   =6,015,000*301/2 
   =3,007,500*301     
   =908,257,500

1.    600.......1,200                         แทนค่า    (ต+ป)*ท/2
วิธีทำ  สูตร(ต+ป)*ท/2                           =(600*1,000)*601
ต=600                                                  =1,800*601/2
ป=1200                                                =540,900
ท=(ป+ต+1)=1200-600+1)=601
2.    333.........999                            แทนค่า    (ต+ป)*ท
วิธีทำ  สูตร(ต+ป)*ท                              =(333*999)*667
ต=333                                                  =1311*667/2
ป=999                                                  =442122
ท=(ป+ต+1)=999-333+1=667

1. 222.....888
วิธีทำ   สูตร   =(ต+ป)*ท/2
                 ต=222
                 ป=888
                  ท=(ป-ต+1)=888-222+1=667
             แทนค่า
              =(ต+ป)*ท/2
              =(222*888)*15
              =1,110*667
                       2
              =555*667
             =370,185

 

 

2. 800......1,500 
วิธีทำ  สูตร=(ต+ป)*ท
ต=800
ป=1,500
ท=(ต+ป)+1=(1,500-800)+1=701
แทนค่า
         (ต+ป)*ท
         =800+1,500*701/2
          =2,300*701/2
          =1,150*701
          =806,150