Crack the Numbers Game: Mastering Quantitative Tests and Estimation Questions in Consulting Interviews

Quantitative tests like the McKinsey Problem Solving Test (PST) are often seen as the biggest hurdle for consulting candidates. These tests combine math, logic, and data interpretation under tight time constraints, demanding both speed and accuracy.

To excel, you must train your mental math skills—practice arithmetic, percentages, ratios, and conversions until they become second nature. For example, quickly calculating 17% of 250 or converting units without a calculator saves precious seconds. Data interpretation requires reading charts and tables accurately to extract relevant information.

Estimation questions test your ability to make reasonable assumptions and simplify complex problems. Instead of striving for exact answers, focus on logical breakdowns. For instance, estimating the number of gallons of gasoline sold weekly at a filling station involves segmenting the problem into cars per hour, hours open, and average gallons per car. Rounding numbers intelligently and using proxies speeds up calculations.

Regular practice with sample PST questions and timed drills builds confidence and reduces anxiety. Resources like Victor Cheng’s video series and practice tests provide valuable guidance.

Mastering quantitative assessments not only helps you clear interviews but also sharpens skills you'll use daily as a consultant—analyzing data and making informed recommendations.