# Math Interview Questions

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### Manager at Amazon.com

Mar 29, 2010
 “If you had 5,623 participants in a tournament, how many games would need to be played to determine the winner”

May 2, 2012
 “What is the sum of the digits of all the numbers from 1 to 1000000? This is different from the sum of the numbers. For instance the sum of the numbers from 1 to 10 is 55 whereas the sum of the digits...”

### Software Engineering Intern at Facebook

Feb 7, 2011
 “Implement a power function to raise a double to an int power, including negative powers.”

### Summer Intern at Five Rings Capital

Apr 25, 2012
 “• Is 1027 a prime number? • How would you write an algorithm that identifies prime numbers? • 2 blue and 2 red balls, in a box, no replacing. Guess the color of the ball, you receive a dollar if...”

### Summer Analyst at Goldman Sachs

May 8, 2011
 “13 cubed”

Dec 28, 2009
 “One thousand 1x1x1 cubes in a 10x10x10 cube. Outside spray painted. How many have no paint.\?”

### Candidates Day Interviews for Multiple Areas (X-Div/Back Office) at Goldman Sachs

Mar 18, 2009
 “If you have a three gallon jug and a five gallon jug No marks on either one The goal is to fill the five gallon jug with four gallons of water How is this accomplished?”

### Analyst at Fidelity Investments

Aug 12, 2011
 “You sell 200 cups of coffee per year at \$10 for a cup. It costs you eight dollars to produce a cup of coffee. Would you rather double your price but loose half of the amount you sell or keep the...”

### Web Development Engineer at Amazon.com

May 24, 2009
 “How would you implement integer division if your language did not offer it.”

Feb 14, 2011