Would you agree that this is the best Maths tip ever!

The best Maths tips ever
I would so love to be in the position of being able to do this out in a restaurant and see the face of the waiter. : )
What a way to give a tip, share this with your lesson as a starter and see if they can work out why this is such a #mathsfunny!
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One for the mathematicians i guess… http://t.co/HHGy47D3Sq pic.twitter.com/yE2ZLLP7br
— Magicalmaths.org (@magicalmaths) April 25, 2015
funny; pi tip for the waiter