In this blog, we are giving you 5 Fast Maths Tricks for Bank and Government Exams. These Fast Maths tricks will help you solve the Questions asked in Quantitative Aptitude Section of the various Bank and Government Exams like RBI Grade B, SBI PO – Mains, IBPS RRB Officer, SSC CGL, SSC CPO and Railway RRB Exams. All such exams require candidates to solve a high number of Questions in Less Time. Therefore, being aware of the following Fast Maths Tricks would save candidates time in solving the Questions and increase their chances of clearing these Exams. So let us Begin
Bank and Government Exams – Fast Maths Tricks
Fast maths tricks – 1: Power multiplication or square of a number that ends in 5
Here the speed would really amaze you. Try finding the square of 85 in your head. How much time did it take you? Now try this fast math trick here.
Ignore 5 in the unit’s place
Take the digit in the tens place i.e. 8 and multiply it with its successor i.e. 8+1 = 9. The result is 72
Simply place 25 at the end of the result i.e. 7225. That’s it. 7225 is the square of 85. That is your answer.
Wasn’t that fast math trick? This math trick can be used anytime you have to find the square of a number ending in 5. It works with 3-digit numbers too. So, the square of 135 is ____?
first, multiply 13 with its successor i.e. 14 = 182. Now add 25 at the end. Your answer is 18225.
Speed in multiplication is all about knowing multiplication tables and facts. So, Memorise multiplication tables to 20.
Fast maths tricks – 2: Multiplying with 11
How do you multiply a number with 11? Let us take an example. Say you have to multiply 35 with 11. Just follow these 3 steps given below.
Write 35 as 3( )5 (where ( ) is a space for a new digit that will be inserted in the middle)
Find the middle digit as 3 (3+5) 5. The middle digit is the sum of the first 2 digits
The number is 385. As simple and as fast as that.
But what if the sum of first 2 digits if more than 9 i.e. a 2-digit number? Let us take an example again. Say the number is 59 that has to be multiplied with 11
Write 59 as 5( )9
Find the middle digit as 5(5+9)9 = 5(14)9. Since the middle digit is not actually a digit but a 2-digit` number, so add 10 to the first digit and retain 4 in the middle
The number is 5+1 (4) 9 = 649. As fast as that
Fast maths tricks – 3: Divide by 5
Say you want to divide 565 by 5. Just follow this 2-step math trick.
Double the number i.e. multiply it by 2. So, you get 1130
Now move the decimal point one step to the left i.e. reduce one 0. So, the answer is 113.
This works with any number, even decimal numbers. So, try it with 142.3
Double up the number. So, you get 284.6
Now move the decimal point to the left by 1 position. So, you get 28.46. That is your answer
Fast maths tricks – 4: Multiplying with 5
To multiply any number with 5 is same as multiplying it with 10 and dividing it by 2. Right? We can use this rule to speed up our multiplication with 5. So here is the trick. Say you want to multiply 236 with 5.
Divide the number by 2 i.e. 118
Now add 0 at the end. The answer is 1180
Was that fast math or what! But wait, what if the answer is in decimal? The rule still holds. Try and multiply 1305 with 5
Divide the number by 2 i.e. 652.5
Now multiply it by 10 i.e. 6525. This is same as adding a 0 at the end or moving a decimal point one step to the right.
Fast maths tricks – 5: Multiplying with 9
Suppose you want to multiply a number by 9, is there a fast way? Well, there is something that will help when you are dealing with large numbers and especially if you are fast with subtraction. Say you have to multiply 81 with 9.
At 0 at the end of the number i.e. 810
Subtract original number from the new number i.e. 810 – 81 = 729
This rule works every time. The only thing is that it gets a little cumbersome when you are dealing with mid-sized numbers say a 4 digit number or so. But this math trick will still make multiplication with 9 faster and less error-prone for most of us. So that was our fast math trick for multiplication with 9
We hope we you Like the 5 Fast Maths Tricks for Bank and Government Exams and you practice these Fast Maths tricks regularly to crack the Bank and Government Exams. We will provide more Fast Maths Tricks for you soon. Keep checking this page.
All the best for Banking and Government Exams
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