GMAT MATH - MATH Shortcut Tricks Email at info@guinnessandmathguy.com for one-on-one online classes. To get your free eBook "How To Calculate Percentages In Your Head", please click the link below: https://guinnessandmathguy.mykajabi.com/pl/2147639130 To join our course "Turn On The Calculator In Your Head", please click the link below: https://guinnessandmathguy.mykajabi.com/sales-page-turn-on-the-calculator-in-your-head For our membership, that will include: 1. Course: Turn On The Calculator I