Mathematics Trick

By Gloson On November 12, 2008 Under Miscellaneous
  • Sumo

Last time, a presenter presented at our school about their mathematics tuition. In the presentation, he taught us a trick to make our division a piece of cake. (Sorry I forgot to post this earlier :) )

However, this trick can only be used when a number is divided by five.

Instead of doing the ‘hard’ way (‘/’ means divide),

40 / 5 = 8

you do the easy way:

First multiply 40 by 2:

40 x 2 = 80.

The answer is 80, right?
Now, you take away the 0.

8

It becomes 8, and that’s the answer.

Isn’t that simple?

But if the number doesn’t end in 0…

41 x 2 = 82

You put a decimal before the last digit.

8.2

That’s the correct answer, right?

Now, this could be useful when dividing biiiig numbers, such as 192123789.

192123789 / 5 = ?

Well, that looks hard, doesn’t it?
It doesn’t?
But it will take more time.

If you use this method, it would be quicker.

x192123789
x             2
x38424757.8

If you don’t like multiplication, simply do this way:

+ 192123789
+ 192123789
+38424757.8

I hope you will find this information helpful. :)

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2 Comments Add yours

  1. Giovanna Garcia
    (2 comments)

    November 22, 2008
    12:23 am

    Great tips on how to teach children to do matt. I am a first time Mom. You blog is going to be very useful for me in years to come :-)

    Thank You,
    Giovanna Garcia

  2. Simon Liew
    (44 comments)

    July 20, 2009
    9:27 pm

    Good, I have similar post in my blog about quick mathematics calculation. If this useful trick does exist in my school time, how good it is.
    .-= Simon Liew´s last blog ..Instant Multiplication (Part 1) =-.

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