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Here is a link for 100% free Warp Speed Math course for adding numbers quickly and easily in your head.
https://www.udemy.com/warp-speed-math-addition-learning-math-the-faster-way/couponcode=Jan2016

This link is incorrect sorry:-(
And correct one is
https://www.udemy.com/warp-speed-math-addition-learning-math-the-faster-way/?couponCode=Jan2016
But now this coupon is expired :-(

Oouchh... this is a duplicate thread... It's free again!

I just grabbed it: http://i.imgur.com/5vHkhwD.png

it's not free again.