Tuesday, April 24, 2012

Easy way to memorize multiplication
====================================================

I introduced this method to my students, but it seem like not working! They still using their traditional method to find the answer.  For example, 2 x 8 = 2 + 2 + 2 + 2 + 2  + 2 + 2 + 2 = 16. Sadly, why they don't just add number 8 twice?! 2 x 8 = 8 x 2 = 8 + 8 = 16. Simple. They can't think of it. I don't blame them (I swear!).

I think 80% of math teachers knew this method. I will just share it again.

Multiplication of number 3 and 7

1.  Arrange the number as below:

         1         2          3
         4         5          6
         7         8          9

Multiplication of number 3:
                                                         start here     
                                                             \/
       2  1   <= 3x7     1     <= 3x4        3     <= 3x1
       2    <= 3x8     1     <= 3x5        6     <= 3x2
         <= 3x9     1  8    <= 3x6        9     <= 3x3

Multiplication of number 7:
                                                       
       2  1   <= 7x3     4      <=7x6      6   3     <= 7x9
       1    <= 7x2     3     <= 7x5      5   6     <= 7x8
             <= 7x1     2  8    <= 7x4      4   9     <= 7x7
           /\
     start here

Multiplication of number 9 (you can use your fingers too)

  Arrange number as below:
                    8    1        <= 9x9
                    7    2        <= 9x8
                    6    3        <= 9x7
                    5    4        <= 9x6
                    4    5        <= 9x5
                    3    6        <= 9x4
                    2    7        <= 9x3
                    1    8        <= 9x2
                          9        <= 9x1
                          /\

                     start here
 
To be continued..
                         
                              
                                 




  






Monday, March 26, 2012

Multiplication @ Pendaraban

Newest post since 2010!! I, as an educator able to solve any problem printed in Malaysian Mathematics textbook, but I failed to solve problem in my classroom.

I believe that Chinese school having less problem than 'non-chinese' school. (ini sekadar keluhan seorang guru.. bukan tujuan untuk membandingkan ). A 13 years old student doesn't know 4 x 3...and the worst is 2 x 0 also dunno la... and if I say so, I'm ready to hear from you..'is your job to make them know'.

Excuse me?! I have done everything that I can. Thank God there are few of the students willing to help themselves memorize those numbers in periodic table.

Why is multiplication so important? Kenapa pendaraban sangat penting?kenapa?!!
1. Almost all the math questions involving multiplication. Hampir semua soalan menggunakan operasi pendaraban.
2. Without memorizing or having multiplication skill, you are wasting your time by adding the numbers. Kalau kamu tidak hafal atau memahami konsep pendaraban, kamu akan membuang masa untuk menambah berkali-kali nombor yang diberi.

Maka ...para pelajar, tolonglah bantu diri kamu sendiri untuk sekurang2nya hafal sifir 1 hingga 5!!