Tricks : Multiply by 9 without pen and paper

Now you’re ready to multiply any number with 9 in 3 sec.

28 X 9 = ?

From Step 2, we’ve to subtract 28 with 3 :

28 – 3 = 25(this is your first part of your answer)

Now from Step 1, we’ve to multiply the unit place of 28 by 9 i.e. 8 X 9.

8 X 9 = 72 and we’ll take only unit place of answer i.e. 2

And, finally merge both step and your answer is

28 X 9 = 252

Let’s take one more example : 57 X 9 =?

57 – 6 = 51

7 X 9 = 63

57 X 9 = 513

 

Source: Magic Multiply by 9 Trick – Mind Calculation in 3 sec 

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