Today we'll go through some very important match tricks that will help you or your friends/students make stand out of the crowd, and crack the test. They can be easily implmented in any aptitute tests. So stay foced and go through all of them and not to mention do practice them a lot.
#1Percentage:
TYPE 1.
if there is increase of X% and subsequently X% decrease then there is always loss / decrease in the condition. ex. If ron's salary is increase by 50% and subsequently decrease by 50%. How much percentage loss? Ans. By trick ---- 50x50/100= 25% decrease/loss TYPE2. if A is P% more than B. then B is less than by A with P/(100+P)x100 ex. If A's earning is 25% more than B's. Then sita earning is how many percentage less then by A's? Ans. By trick ---- 25/(100+25)x100=20%
TYPE 3.
If A is P% less than B. then B is more than by A with P/(100-P)x100 ex. If goku's age is 20% less than gohan than gohan's age is how many percentage more than goku? ans. By trick ---- 20/(100-20)x100=25% TYPE 4. if there is p% increase in price . how much % decrease his consumption so that his expenditure on it does not change. formula P/(100+P)x100 ex. If petrol price increase by 25%. How much percentage a person reduced his consumption so that his expenditure on it does not increase? ans. 25/(100+25)x100=20% #2 Squaring:
In this simple trick we need to modify the equation and make the units digit zero. After all it is easy to multiply when units digit is zero.
For example - Find square of 43 = (43+3) × (43-3) + (3×3) =(46×40) + 9 = (460×4) + 9 = 1840 + 9 = 1849 Paid Udemy courses Yet they are for Free!!
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AuthorA Math Lover!! I have trained students who used to fear from Maths and now are active participant in the Math Contest conducted all around the world Archives
September 2016
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