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Mathematics ⇒ Multiplying any number by 15 the fastest wayViews: 2298
Multiplying any number by 15 the fastest way

#Rule: Attach 0 to the number and add halve of the result to the original number.

# Example
>>>68 * 15

#Step 1: Attach zero to the number
>>>680

#Step 2: Add halve of the result (e.g halve of 680 = 340) to the result
>>> 1/2(680) + 680
>>> 340 + 680
>>> 1020

Quite simple and fast isn't it?

# Try this and time yourself
>>>99 * 15
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Started by: Prodigy on Feb 26, 2015


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Quadratic Equation:
Ax2 + Bx + C = 0
A =
B =
C =
X1 =
X2 =

Credit: Samuel George

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