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December 20, 2011

Additions Shortcuts

65 comments

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Addition of numbers close to multiples of ten (e.g. 19, 29, 38, 59 etc.)



This technique is useful for Mental calculations

116 + 39 (Here we can write this 39 as 40-1)
= 116 + (40 - 1)
= 116 + 40 - 1
= 156 - 1 (Instead of adding 39 to 116, we just add 40 to 116 (because we can do this without using pen and paper) and later we subtract one from it)
= 155
Try this.. This is very useful tip while doing calculations.

Now lets try another example. 
116 + 97
= 116 + (100 - 3)
= 116 + 100 - 3  (Here, instead of adding 97 to 116, we are just adding a 100 to 116 and then subtracting 3 from it :)
= 216 - 3
= 213


Addition of decimals

12.5 + 6.25
= (12 + 0.5) + (6 + 0.25) 
= 12 + 6 + 0.5 + 0.25 (Here we just added the rounded numbers first and later we added the decimal numbers :)
= 18 + 0.5 + 0.25
= 18.75

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65 comments:

  1. Good work helping so much...... veera

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    Replies
    1. I am just looking for this site.....

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  2. really it is very useful

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  3. very simple & nice tricks

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  4. nice tricks very useful thanks a lot

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  5. its very usefull site sirr..............

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  6. Very easy to understand and follow. thank you

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  7. its very useful site sir .........thank u

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  8. gattisaidulu@gmail.com

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  9. love you gr8ambitionz team....

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  10. thanks a lot, please post how to remember formulae in some questions.

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  11. very nice keep it up

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  12. nice trick to mental calculation

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  13. nice trick i want more like this

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  14. nice work keep it up..thanks

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  15. please provide more techniques....it is very nice but getting problems in exams is some difficult.. thanq

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  16. do u have any blog to join this for regular updates

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    Replies
    1. At the right side of this blog you can find join this site option Laxmi... Or you can follow us on Facebook for regular updates.

      All the best :)

      Delete
  17. i didn't find it useful b'coz these are cheeze tricks , but still writer did well according to him, difficulty level of question is much higher.

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    Replies
    1. not much higher,if one considers individual & total cutoffs both then it becomes much much much higher
      maam,Please upload more difficult level problems in examples

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  18. its very useful for me ... thanks alottt sir !!!

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  19. Its very useful...thanks

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  20. Really this is being a usefull website for me always...thanks for entire gr8ambitionz team...

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  21. This site was extremely good and day by day I am Impoving a lot thanks to GR8 AMBITIONZ and the website is also GREAT

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  22. Came across this site today. Learnt a lot within a short time. Really understandable in a short span of time. Thanks a lot. Cheers! :)

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  23. i too hav a shortcut trick for quick addition i.e Q)3245+4356+2453+7896=17950.
    now we start from right hand side 6+3+6+5=20 .we will write 0. again add 2(carry forwd)+9+5+5+4=25 now we wll write 5. again add 2+8+4+3+2=19, write 9. add 1+7+2+4+3=17 this tym we will write 17 so the ans is 17950. this can be done in mind only after thoroughly practicing.

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  24. thank you very much.it is useful.nice trick

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  25. thank you very much.it is useful.nice trick

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  26. Very helpful .. Thank a lot

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  27. Thnku Its Very Useful :)

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  28. Thanks for giving me this opportunity website team

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  29. VERY USEFUL WEB SITE

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  30. wow..... awesome.... thank you for your fantastic service.

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  31. thanks , these tricks are very helpful...................

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  32. really helpful, thanx a ton.

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  33. this is very much helping ,... thankyou soo much

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  34. hmmmmmm,,,,,, gud one.

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  35. this is very usefull to me and all my friends.Thanks and nice job

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  36. please put actual question with short techniques

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  37. really very useful

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  38. Wow! nice short cuts for addition.

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  39. How to do 4 -5digit numbers addition or subtraction??
    Plz guide!

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