MATHS SHORTCUTS
 

PERCENTAGE SHORTCUTS..

 

WHAT IS PERCENTAGE?

Percent is representing a number in ratio of 100.

PERCENT ==> "PER" + "CENT", here 'cent' means 100..... Percent is nothing but "Per 100".

Percentage is denote by "%".  30% means 30/100.

Percentage is used most of the times in our day to day activities. Say example, 50% discount in product, 10% free,...

So there are more question in entrance exams from this topics.

Let's take an example...

50% of 50 is  50/100*50 = 25.

PERCENTAGE SHORTCUTS


Doing percentage in mind will be easy. But needs continuous practice.

Let's take an example,
60% of 800.

100% of 800 = 800

   50% of 800 = 400

    10% of 800 = 80

       5%  of 80 = 40

Thats it,  60% = 50% + 10% = 400 + 80 = 480.

Answer: 60% of 800 =480. (in mind in few secs...)


15% of 800. 

10% + 5% = 80+40 = 120

Answer: 15% of 800 = 120. (in mind in few secs...)

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90% of 800.

100% of 800 = 800

   50% of 800 = 400

    10% of 800 = 80

       5%  of 80 = 40

Thats it,  90% = 100% - 10% = 800 - 80 = 740.

Answer: 90% of 800 = 740. (in mind in few secs...)


Another Example:

60% of 90, 25% of 90, 12% of 90,  85% of 90....

 

100% of 90 = 90

   50% of 90 = 45

    10% of 90 = 9

      5%  of 90 = 4.5

        1% of 90 = 0.9

Thats it,  

60% of 90 = 50 % + 10% = 45 + 9 = 54. 

Answer: 60% of 90 = 54. (in mind in few secs...) 

25% of 90 = 10% + 10% + 5% = 9 + 9 + 4.5 = 22.5 

Answer: 25% of 90 = 23.5 (in mind in few secs...) 

12% of 90 = 10 % + 1% + 1% = 9 + 0.9 +0.9 =  9 + 1.8 = 10.8. 

Answer: 12% of 90 = 10.8. (in mind in few secs...) 

85% of 90 = 100% - 10% - 5% = 90 - 9 - 4.5 = 90 - 13.5 = 76.5 

Answer: 85% of 90 = 76.5 (in mind in few secs...)



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