Brain Teaser to find the Missing Number

This is a very interesting Brain Teaser in which your challenge is to find the value of the missing number which will replace the question mark. Solving this Missing Number Brain Teaser will help you to improve your mathematical and logical reasoning power. 
In this Circle Missing Number Brain Teaser, you are shown some numbers inside and outside the circle. Your challenge is to find the relationship among these given numbers and then find the missing number which replaces the question mark.

Can you find the missing number?

The answer to this "Brain Teaser to find the Missing Number", can be viewed by clicking on the answer button.

The Answer is 0
Numbers in the Outer Circle is the unit place digit of multiplication of numbers in the opposite segments inside the Circle.
So 5x6 = 30 gives us 0 which is the unit's digit.

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