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December 14, 2011

Subtractions Shortcuts

34 comments

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PLEASE READ THE SHORTCUTS IN ADDITIONS FROM HERE FIRST. 

SO THAT IT WILL BE EASY FOR YOU TO UNDERSTAND SUBTRACTION SHORTCUTS 


SUBTRACTION BY NUMBERS CLOSE TO 100, 200, 300, 400, ETC.

250 - 96 
= 250 - (100 - 4) (here, instead of subtracting 96 from 250, we are just subtracting 100 from 250 and then adding 4) 
= 250 - 100 + 4 (Why adding? because the actual amount we have to subtract from 250 is 96. but we are subtracting 100. That means, we are subtracting 4 numbers more than we actually deserve. so our 250 will feel bad. so we should add that 4 to it:)
= 150 + 4
= 154

250 - 196
= 250 - (200 - 4) 
= 250 - 200 + 4 (here also same. In order to subtract 196, we subtract 200 and adding 4)
= 50 + 4
= 54

Note : We can use this logic for any number. According to our convenience.

Lets see, 

216 - 61 (Here i found it difficult to subtract 61 from 216)
= 216 - (100 - 39)  (So i just decided to subtract 100 to it and later will subtract the extra 39)
= 216 - 100 + 39 (Hey, see here. How about writing this 39 as 40 -1 ?)
= 116 + (40 - 1) (dont be confused. just practice this method and you will come to know how easy and efficient method it is :)
= 156 - 1
= 155

Subtraction of decimals
47 - 9.9 (How about dividing this 9.9 as 9 + 0.9 ??)
= 47 - (9 + 0.9)  we can write this as...
= 47 - 9 - 0.9  
= 38 - 0.9
= 37.1

18.3 - 0.8
= 18 + 0.3 - 0.8
= (18 - 0.8) + 0.3 
= 17.2 + 0.3 
= 17.5



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34 comments:

  1. Hi madam...u hav really provided us a such an excellent blog for our ibps cwe exam...ur's is such an awesome job in providing excellent materials for our ibps online exam...Thank u so muchhhhhhhhhhhhhhhhhh......

    Madam, plz tell whether we hav GD in our ibps cwe clerks2 interview r not...or do they conduct only common interview wthout GD....
    if we r going 2 hav GD also, den plz guide us in GD section also by providing the expected topics and materials for GD section in dis common interview...HOPEFULLY WAITING FOR UR PRECIOUS REPLY MADAM...THANK U

    ReplyDelete
    Replies
    1. According to the information we've received from IBPS, there wont be GD for common interviews...

      Delete
    2. mam quick guide for clearks rrb is excellent.most of the questions have 4m dat guide

      Delete
  2. Hello sir/ madam u have provided good material for ibps cwe. I want hard copy of this material. This material is available in market.If it is available please tell me how can i get this material.



    HOPFULLY WAITING FOR YOUR REPLY..

    ReplyDelete
    Replies
    1. First of all sorry for the late reply venkat, we were unable to reach you due to our server problems. And we post materials here only friend, so you cant get them from market.

      Good Day

      Delete
  3. ma'am am not goin' to any coachings for ibps exam due to lack of time. is this material is helpful for me to complete ma preaparations regarding all concepts?

    ReplyDelete
  4. ma'am due to lack of time am unable to prepare and maintain the preparation time for ibps exam. is your material is helpful for me to cmplte ma preparation with in 10 days. can i cmplete ma prepartion with ur material?

    ReplyDelete
    Replies
    1. Well, its lil difficult task to complete preparation in 10 days Srinu Rao... Anyways, Work hard. And yea, all our materials are enough for IBPS clerks Preparatoin Friend. But personally we don't think we've complete resources for Reasoning. So you should take care of that area. And download our monthly current affairs pdf files and quick reference guide. Work on practice papers we've already provided.

      just check the below link for detailed guidance

      IBPS Clerks Study Materials and Model Papers

      Do ask us if you have doubts / difficulties in any topic

      All The Best

      Delete
  5. Hi mam really nice article.. But i have to share one more tips for this article.
    1. 250-96 now add 4 to right side so we will get 100, 250-100=150.. Now just Add the same number (4) in leftside which we used in rightside so answer is 154.
    2. 216-61 add 39 in rightside to bring 100. 216-100=116 now add 39 to leftside (we can also use addition shortcut 40-1 here)..answer is 155. 3. 47-9.9 add 1 to leftside and rightside so answer is 37.1.
    Note add the same number in leftside which is used in rightside. Thanks

    ReplyDelete
    Replies
    1. Thank you so much for the useful update friend...

      Delete
  6. thank u very much for providing this study materials

    ReplyDelete
  7. Thanks for every thing you do for....

    ReplyDelete
  8. Hii madam/sir

    from few days..bck..im searching here n there..for useful IBPS prepartion portal..but nw n den all provide..same kind of study material..not worth reading...but urs is good1 for any IBPS ASPRIRANT...so first of all wud like to thnks all admin..fr providing us such a useful material..for free of cost...it is really appreciated....
    hey...i have also filled the IBPS PO this time..which is goin to held on oct mid..but didnt start preparing till nw..i hv vry less tym to prepare..so wnt ur guidelines n support..to hw i will wrk to crack EXAM...as i am a housewife..after doin all my domestic chores..i spare my few hours fr studing n all..i find CA SECTION BIT difficult...how wil i improve on dis..hoping to have a immediate response .....thnks..n regards...

    ReplyDelete
    Replies
    1. No need to be tensed Neha. As you already have idea on the pattern of the exam 40 days are more than enough for your preparation.
      We have already uploaded a detailed Preparation plan for IBPS Exams . Please do read it once. Try to spend 5 hours a day (2 hours morning and 3 hours during the day). Try to complete whole preparation by September 30th. From October 1st you can concentrate on practice tests.

      For Current Affairs first try to complete our Banking Awareness material posted above. Read news paper daily and try to note down important points. Last 6 months' current affairs are enough for the exam.

      Do ask us if you have any more doubts. All the Best.

      Delete
  9. 216-61
    216-(60+1)
    216-60-1
    156-1
    155

    ReplyDelete
  10. 47-9.9
    47-(10.0-0.1)
    47-10.0+0.1
    37+0.1
    37.1

    i think its better solution........

    ReplyDelete
  11. Could you plz tell me short trick for below questin
    897210-336-46521-1249-63176=?

    ReplyDelete
    Replies
    1. Please do check the below link
      http://www.gr8ambitionz.com/2012/04/mental-maths-subtractions.html

      Delete
    2. Step 1: -336-46521=-46857
      Step2; -46857-1249=-48106
      Step3: -48106-63176=-111282
      Step4: +897210-111282= 785928. ( - - = +).

      Delete
  12. mam i want material for ssc exam plz if u cn hep me on dat esp in maths section i want shortcut tricks for dat

    ReplyDelete
  13. This blog is very useful for competitive exams... ...

    ReplyDelete
  14. can you suggest best book for ibps clerks,it officers exam from which repetitive questions may come

    ReplyDelete
  15. it is really helpfull ...
    it really helps student who economically can not afford classes or costly books :)
    honourably thanking you :) for creating this site :)

    ReplyDelete
  16. do any know wen s nxt ibps exam??? plz reply

    ReplyDelete
  17. complete reasoning material plss mam

    ReplyDelete
  18. complete reasoning study material plssss mam

    ReplyDelete

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