Tricks for additions

Things needed :

• paper
• pen/pencil
• a friend

Procedure :
Ask your friend to write down five digits from 1 to 9 on a paper like this
                                                            2 4 5 6 7
you write the numbers parallel to it and see that the sum of both the numbers should come 9 like this
                                                            7 5 4 3 2
if you observe this you can see that the sum of both this numbers come 9 like this
                                                            2+7=9
                                                            4+5=9
                                                            5+4=9
                                                            6+3=9
                                                            7+2=9
now again ask your friend to write again five digits and you write according to the digits that their sum will be equal to 9

last step ask your friend to write again five digits and you subtract 2 from the last digit the last digit should be greater than or equal to 2 and write in the answer the answer you got from subtraction and write down the remaining digits as it is.At the beginning of the answer keep 2 that's all you can give your answer to your friend withing a fraction of time

for example------

friend                                        2 4 3 1 9 
you                                      +   7 5 6 8 0
friend                                   +   6 1 0 4 2
you                                      +   3 8 9 5 7
friend                                   +   6 5 9 2 5
answer                                   2 6 5 9 2 3               
 
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