Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: Multiplying a number by 9 in few seconds.
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hemang (1665)

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this is even simpler to comprehend.

let that number be x.

we want 9x.

you just did this -

10x - x.

:)

 


mathematics is the food of my soul. There are 3 types of people in the world. Those who can count and those who can't . :-)
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