Tuesday, 29 November 2011

Find the products

             Question 1 :

               2 ⅔ X 12 = 3  X 12
                                             = 8 X 12
                                        3
                                  = 96 32
                                                   3  1
                                              = 32

Monday, 21 November 2011

convert mixed numbers to percentage

                Example :
                Amira is learning to do the cross stitch. She has completed the cross stitch on
                1 whole piece and   7     on the other piece. What is the percentage of cross
                                             10
                stitch that she has completed?
                

                   1 whole piece = 100 cross stitches

                                         =  100   x 100 %
                                             100

                                         = 100 %

                   7  piece = 70 piece   = 70 cross stitches
                 10             100       
                                                 =  70    x100 %
                                                    100

                                                                = 70 %

                                                100 % + 70 % = 170 %

Sunday, 20 November 2011

Examples 3

           Example :  398635 x 24  =  9567240                   
  

                 3         9         8         6         3         5      
               0                        1        0        1          2
                    6         8         6         2        6        0       
               1         3        3         2        1                 4            
                   2         6         2                 2         0                  
    +      (1) (1)                 (1)                                       
              9   5          6        7          2         4         0     

Let's do it

                 Can you answer this question ( doing by board format ) :
                            
                            22982 x 61 = ____________

                           
                 

Multiplying five-digit numbers by two digit

              Example : 48156 x 63 = 3033828

                               Board
              1      4      8      1      5      6
              2     08    16    02    10    12
                  12    24    03    15    18
              4     16    32    04    20    24
              5     20    40    05    25    30
              6     24    48    06    30    36
              7     28    56    07    35    42
              8     32    64    08    40    48
              9     32    72    09    45    54
               
              Add up these numbers
              3 x 4                         =      12
              3 x   8                       =        24
              3 x     1                     =           03
              3 x       5                   =             15
              3 x         6                 =   +          18
                                                        144468

              Add up these numbers
              6 x 4                         =       24
              6 x   8                       =         48
              6 x     1                     =           06
              6 x       5                   =             30
              6 x         6                 =    +         36
                                                        288936

                                                         48156
                                                  x           63
                                                       144468
                                                 +  288936  
                                                     3033828

Funny of multiplication

                     Example : 321485 x 7 = 2250395

                                   Board
                 1     3      2     1     4    8     5
                 2    06   04   02   08   16   10
                 3    09   06   03   12   24   15
                 4    10   08   04   16   32   20 
                 5    15   10   05   20   40   25
                 6    18   12   06   24   48   30
                 7    21   14   07   28   56   35 
                 8    24   16   08   32   64   40
                 9    27   18   09   36   72   45


                                Add up these numbers
                               7 x 3                           =     21                
                               7 x   2                         =       14
                               7 x      1                      =         07
                               7 x        4                    =           28
                               7 x          8                  =             56
                               7 x            5                =  +           35
                                                                          2250395