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How to multiply 55 to itself faster


PiNoY

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Here's a simple way on how to multiply 55 to itself faster?

 

We know that 55 multiply to itself can be represented by the figure :

 

55

x 55

====

3025

 

The answer is 3025.

 

NOW, any numbers being multiplied to itself like

 

55 times 55 ,

 

75 times 75 ,

 

35 times 35 or

 

25 times 25 ,

 

can have a faster answer being done from the mind. HOW??

 

For example? Taking 25 x 25 (25 times 25) can be taken AS

 

25

x 35

=====

625

 

NOTICED that 2 multiply to 3 is 6 then simply append 25. You will get 625. The trick is to ADD 10 to the number then proceed with FIRST NUMBER multiplication.

 

 

 

 

ANOTHER EXAMPLE for 55 multply to itself as in 55 x 55.

 

 

55

x 65

====

3025

 

NOTICED that 5 x 6 = 30 , so we append 25 to the number, the answer becomes 3025, which is the correct answer. Get it? Append 25 to 30 becomes 3025! So 55 times 55 equals 3025.

 

 

 

 

Enjoy! smile.png

Edited by Fearless Staff
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I was thought this in grade 3

 

I wish I was.. These kinda things were what made me love maths when I was in primary school (age 4-10/11).. Then in secondary school (age 11/12 - 16), we weren't taught any intriguing things like this.. Probably why I ended up hating maths, never going, and getting a B in my final exams lol (sounds ok but it was the lower end of my results)

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