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This technique is useful for Mental calculations
116 + 39 (Here we can write this 39 as 40-1)
Now lets try another example.
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
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 :)
= 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
Good work helping so much...... veera
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V.useful tips
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nice tricks
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ReplyDeletei too hav a shortcut trick for quick addition i.e Q)3245+4356+2453+7896=17950.
ReplyDeletenow 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.
Very helpful .. Thank a lot
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ReplyDeleteHow to do 4 -5digit numbers addition or subtraction??
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