Tricky Mathematical Brainteaser #16: Can You Solve It?

Are you a puzzle master? A math genius? Then you are going to love this series of mathematical brainteasers. All you have to do is find the missing number - sounds easy right? Well give it a go and tell us how you do. 

In this challenge there are four squares arranged in a 2x2 format. Each square has four number which have a certain mathematical relationship with each other. Figure out the relationship and find the missing number. 

apost.com

How did you go? Did you figure it out? We have the answer below so that you can double check if you are right but don't cheat if you havent worked it out yet! 

Test your friends and SHARE this challenging brainteaser with your friends and family!