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Banking Exam Preparation – ADDITION and SUBTRACTION- Part II


Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

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Continue from Banking Exam Preparation – ADDITION and SUBTRACTION- Part I

Counting Series (Natural Numbers):-

E.g. 1,2,3,4,5,6,7    means start from 1 and useful for counting.

We can also apply Group addition method or we can apply formula

 

Formula –            n(n+1)/2

 

Or Sum of odd numbers of series + sum of even numbers of series

Where                  n  = number of elements in series

 

For e.g.                  7(7+1)/2

7×8/2

56/2

28

Our answer is 28

 

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

Sum of all Odd numbers starting from 1.

 

E.g. Sum of the all odd number between 1 to 100.

 

Formula –             n2

Where                  n = number of elements in series

 

For e.g. number of elements in series are 50

Then sum of the all odd number between 1 to 100 is 502 = 2500

Our answer is 2500.

 

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

Sum of all Even numbers starting from 1.

 

E.g. Sum of the all odd number between 1 to 100.

 

Formula –            n(n+1)

Where n = number of elements in series.

For e.g.  Number of elements in series are 50

Then Sum of the all odd number between 1 to 100.

50(50+1) = 50×51= 2550

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

Sum of squares of first ‘n’ natural numbers

E.g.  12 + 22 + 32 + 42 + 52

Formula –            {n(n + 1)(2n + 1)}/6

For e.g. 12 + 22 + 32 + 42 + 52

n = 5

= 5(5 + 1)(2×5 +1)/6

= 5x6x11/6

= 55

Our answer is 55.

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

Sum of cubes of first ‘n’ natural numbers

E.g.  13 + 23 + 33 + 43 + 53

Formula –            {n (n + 1)/2}2

For e.g. 13 + 23 + 33 + 43 + 53

n = 5

= {5 (5 + 1)/2}2

= {5 x 6/2}2

= 225

Our answer is 225.

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

SUBTRACTION:-

  1. Left to right method-

Calculate subtraction from left to right.

E.g. 1527 – 798

Then 1500 – 700 = 800

Now we need to less 98 then less 100 and add 2

Then 800 – 100 + 2 = 702

Now add 27

Then 702 + 27 = 729

Our answer is 729.

 

  1. Think that what number added to smaller to equals the larger

Calculate from left to right

E.g. 884 – 340

Then 800 – 300 = 500

If we add 44 in 30 so we get 84.

Then our answer is 500 + 44 = 544

 

  1. Add a number to larger to round to next highest ‘0’ and then add same number to smaller and subtract

Calculate from left to right

E.g. 595 – 278

Then 595 + 5 = 600 and 278 + 5 = 283

Then 600 – 283 = 317

Then our answer is 317

 

  1. Add a number to smaller to round to next highest ‘10’, ‘100’ etc and then add same number to larger and subtract

Calculate from left to right

E.g. 831 – 678

Then 678 + 22 = 700 and 831 + 22 = 853

Then 853 – 700 = 153

Then our answer is 153.

Banking Exam Preparation – ADDITION and SUBTRACTION- Part II

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Continue to Banking Exam Preparation – ADDITION and SUBTRACTION- Part III

You can also find

BANKING EXAM PREPARATION – CUBE AND CUBE ROOT

Banking Exam Preparation – ADDITION and SUBTRACTION- Part I

Banking Exam Preparation – ADDITION and SUBTRACTION- Part III

Banking Exam Preparation – “Square and Square Root”

Banking

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