Teknik Pendaraban 50 - Tuisyen Matematik

A. Multiplying by 50 is the same as multiplying by 5, except if the number is even you write 00, and if the number is odd you write 50.

1. When multiplying by 50, it is easier to divide by 2 and multiply by 100.
2. If the number you are multiplying is odd, then the last numbers will be a 50 (see Ex [2]), otherwise the last number is 00.

B. Examples:

Ex [1] 126 x 50 =_________.

a) 126 ÷ 2 = 63. Write 63.
b) Since 126 is even the last numbers are 00.
c) The answer is 6300.


Ex [2] 321 x 50 =_________.

a) 321 ÷ 2 = 160 with a remainder of 1. Write 160.
b) Since there is a remainder of 1 the last numbers are 50.
c) The answer is 16050.