Brain Maths Question for Students with Solution

This Brain Maths Question is for school going kids. In this Maths Puzzle Question, there are some numbers given in four squares. Numbers in each of the square relates to each other Mathematically. Can you decipher this Mathematical relationship or pattern among the numbers in each of the squares and then find the missing number which will replace the question mark in one of the squares?

Can you find the missing number?

The answer to this "Brain Maths Question for Students", can be viewed by clicking the below button.

The Answer is 21.
In each square multiply the unshaded  corner digits and then subtract the remaining unshaded digit from this multiplication to get the number in the shaded part of the square.

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