adding nine

by goldpearl



if u add any no by 9, first sub the last unit by 1 then add 1 to the last before unit.


for eg:1.45+9 is 5-1=4

then 4+1=5 i.e 54.. thats it.

2.55562+9 is
2-1=1
6+1=7 i.e 55571.. wow!it's done

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