M A T H S M I N D S

How much money is in your friend’s pocket

Step 1:

Ask your friend to write a number corresponding to the money in dollars

Step 2:

Ask him to multiply with 2

Step 3:

Ask him to add 1

Step 4:

Ask him to multiply with 5

Step 5:

Ask him to tell the result

Step 6:

Cancel the unit place 5 of the result in your mind and reveal the money

Secret Always you get 5 in the units place of the result.

	Step 1:	Let the money in your friend’s pocket be $25
	Step 2:	Multiply 25 x 2 = 50
	Step 3:	Add 1 to 50, we get 50 +1 = 51
	Step 4:	Multiply with 5, we 51 x 5 = 255
	Step 5:	Cancel the units place 255
	Hence the money in your friend’s pocket is $25

Algebraic Explanation:

Always you get 5 in the units place.

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