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Shortcut methods for Bank Quantitative Aptitude Questions?

This is a discussion on Shortcut methods for Bank Quantitative Aptitude Questions? within the Quantitative/Arithematic forums, part of the Study Material and Resources category; Shortcut methods for Bank QA 1)To square any number ended wid 5 e.g. 65*65 solution: 1)Square R.H.S of given no.i.e. 5*5=25 2)Multiply the L.H.S no. by 1 more i.e.6*7=42 3)concatenate answers of step2 and step1 ...

      
  1. #1
    Assistant Manager Sharad Jain is on a distinguished road Sharad Jain's Avatar
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    Wink Shortcut methods for Bank Quantitative Aptitude Questions?



    Shortcut methods for Bank QA


    1)To square any number ended wid 5
    e.g. 65*65
    solution: 1)Square R.H.S of given no.i.e. 5*5=25
    2)Multiply the L.H.S no. by 1 more
    i.e.6*7=42
    3)concatenate answers of step2 and step1
    i.e. 42 and 25 =4225
    so SQUARE of 65 = 4225.






    2)To square any number between 30 to 70
    Square of 52
    a)Subtract 52 from 50 i.e 52-50=02
    b)Add it wid 25 i.e. 25 02 = 27
    c)now square the result of step a
    i.e. 02*02 = 04
    d)Now merge the answer of b and c
    i.e. 27 and 04 so it become 2704
    square of 52 is 2704.
    for number less than 50 only we have to change step b rather to add we subtract the result of step a by 25 in step b
    note in case of 62 where
    in step a) as 62-50 =12
    step b)25 12 = 37
    step c)12*12=144
    step d) merge it as
    37
    144
    answer is: 3844






    3) How to multiply any no.with 11
    e.g.
    23543456*11 = 258978016
    a)write 1st and last digit as it is
    b)now add all consecutive no. and write it in
    between 1st and last digit also use concept of
    carry add from right side of number
    2(2 3)(3 5)(5 4)(4 3)(3 4( 1carry))(4 5( 1carry))
    (5 6)6 = 258978016

    perhaps i think u can understand the above trick or it will be in long term in ur mind



    Last edited by RPS; 05-04-2012 at 12:23 PM.
    RPS, amit, nani1433 and 1 others like this.
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    Active Member amit is on a distinguished road amit's Avatar
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    square of any TWO DIGIT NUMBER number

    say 24^2
    CONSIDER 24 AS AB
    step I - B^2
    STEP II- 2*A*B + ANY CARRIED FORWARD OF STEP Ist
    step III A^2 +CARRIED FORWARD OF STEP IInd

    lets take 24^2
    STEP I- 4^2 = 16 WRITE 6 AND ONE CARRY FORWARD TO NEXT STEP 6
    STEP II 2*2*4 +1( CARRY FORWARD OF STEP iST) 17 WRITE 7 AND 1 CARRY FORWARD 7
    STEP III 2^2 +1 CARRY FORWARD OF STEP II 5
    ============
    24^2 ANS 576
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    Thanks for sharing.

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    Quote Originally Posted by Sharad Jain View Post
    Shortcut methods for Bank QA


    1)To square any number ended wid 5
    e.g. 65*65
    solution: 1)Square R.H.S of given no.i.e. 5*5=25
    2)Multiply the L.H.S no. by 1 more
    i.e.6*7=42
    3)concatenate answers of step2 and step1
    i.e. 42 and 25 =4225
    so SQUARE of 65 = 4225.






    2)To square any number between 30 to 70
    Square of 52
    a)Subtract 52 from 50 i.e 52-50=02
    b)Add it wid 25 i.e. 25 02 = 27
    c)now square the result of step a
    i.e. 02*02 = 04
    d)Now merge the answer of b and c
    i.e. 27 and 04 so it become 2704
    square of 52 is 2704.
    for number less than 50 only we have to change step b rather to add we subtract the result of step a by 25 in step b
    note in case of 62 where
    in step a) as 62-50 =12
    step b)25 12 = 37
    step c)12*12=144
    step d) merge it as
    37
    144
    answer is: 3844




    3) How to multiply any no.with 11
    e.g.
    23543456*11 = 258978016
    a)write 1st and last digit as it is
    b)now add all consecutive no. and write it in
    between 1st and last digit also use concept of
    carry add from right side of number
    2(2 3)(3 5)(5 4)(4 3)(3 4( 1carry))(4 5( 1carry))
    (5 6)6 = 258978016


    perhaps i think u can understand the above trick or it will be in long term in ur mind



    Can you please the change the color of the font. Unable to read.
    nimish.sukhdeve likes this.

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    Active Member narender is on a distinguished road narender's Avatar
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    Thanks a lot for sharing valuable information...

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