A Message From the Creator


Hello! My name is Matthew Tambiah I’m the Creator of FastMath, a unique mental calculation system. I’m a former McKinsey consultant and I graduated with highest honors from Harvard with  a Bachelor’s degree in Electrical and Computer Engineering, and have an MBA from MIT Sloan.

Math has always come naturally to me, and I was always helping friends out with math and science courses in high school, in college at Harvard, and in business school at MIT. Over the years, I have seen first-hand that many people struggle with math. I always through “if I were teaching this topic, I would teach it different!” 

Well, now I’m doing that! I created FastMath to teach the way I think about math — and calculations in general — which was always very different from the way math was taught in school. I always looked for the simplest way to solve a particular problems, rather than taking a one-size-fits-all approach to calculations. 

In FastMath I will teach you how to do this too! I will show you how to solve problems with the least amount of effort, and in the fastest and most efficient manner. But to do this, you really need to understand math, which I'll also teach you in FastMath courses.

FastMath will show you that math doesn't have to be scary and in-comprehensible, but is actually a very useful tool.

Don’t worry, I won’t sell your information or your friends' information to others, or send you excessive amounts of spam.

So join now to learn how FastMath can help you succeed in your job interviews.

FREE Interview Math Includes:

  • Overview of Case Interviews and why Quant Skills are important

  • 2 Full Case Examples and Solutions from MBB firms

  • Quant Assessment Quiz and Scoring Guidelines: identify areas for improvement

  • 6 Video Lessons of Calculation Methods and their application to Quant Case Interview Problems

  • Practice Problems

  • Mental Calculation Exercises

  • All for FREE!

Trusted by Students From


Sign Up for FREE!

So sign up for the FastMath FREE Interview Math course to get access to these resources and new FREE resources I create in the future.
Join for FREE

Course curriculum

  • 1


    • Confidentiality Statement
  • 2

    MBB Case Examples — with Solutions

    • McKinsey Full Case: Catalog Retailer
    • BCG Full Case: Customer Segmentation Strategy
  • 3

    Overview: Case Interviews & Quant Skills

    • Context of Quant Problems in Case Interviews
    • Course Math Requirements
  • 4

    FastMath Overview

    • FastMath Introduction & Background
  • 5


    • Multiplication Methods
    • Breakeven and Profitability Analysis
    • Example — Luxury handbags
    • FAST Compound Growth Calculations

Created By

Matthew A. Tambiah is the creator of FastMath. Matthew is a former McKinsey consultant and has a Bachelor’s degree from Harvard with highest honors in Electrical and Computer Engineering, and an MBA from MIT Sloan. Matthew is an internationally recognized expert on quantitative and calculation skills for job interviews and business professionals. Matthew has hosted FastMath Workshops to teach quantitative and calculation skills for job interviews for MBA, undergrad, and PhD students at Harvard Business School, Wharton, MIT, London Business School, Georgetown, INSEAD, and other leading universities. Thousands of candidates from nearly every major university worldwide — including Duke, Yale, Brown, UCLA, Georgia Tech, Cornell, Indian Institute of Technology, Carnegie Mellon, UVA, Oxford, Cambridge, HEC, IESE McGill, UBC, and Vanderbilt — have used the FastMath resources (Online Courses, Workshops, and WorkBooks) to prepare for Case Interviews at leading companies. Matthew’s students have joined elite consulting, technology, and finance companies such as McKinsey, Bain, BCG, Accenture, Deloitte, PwC, KPMG, EY, LEK, Amazon, Google, and many other leading firms. 

Get Updates!

I'm working on new material for interviews in Finance and other fields and for business professionals — enter your email to be notified when they're ready!