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**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 :)**
= 213

Addition of decimals

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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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.

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