Master speed math tricks and mental calculation techniques used by professional traders. Practice with timed exercises designed specifically for quantitative trading interviews.
Learn proven mental math techniques used by professional traders to calculate quickly and accurately under pressure.
Practice with realistic time constraints that mirror actual quant interview conditions and trading floor scenarios.
Exercises specifically designed for quant interviews at top firms like Flow Traders, Jane Street, and Citadel.
247 + 156 = ?
Step 1: Break into hundreds and tens: (200 + 100) + (47 + 56)
Step 2: Calculate: 300 + 103 = 403
Result: 247 + 156 = 403
3/4 + 1/6 = ?
Step 1: Find common denominator: 12
Step 2: Convert: 9/12 + 2/12 = 11/12
Result: 3/4 + 1/6 = 11/12
15% of 240 = ?
Step 1: 10% of 240 = 24
Step 2: 5% of 240 = 12
Result: 15% of 240 = 36
23² = ?
Step 1: Use formula: (a + b)² = a² + 2ab + b²
Step 2: 20² + 2(20)(3) + 3² = 400 + 120 + 9
Result: 23² = 529
Most quant interviews expect you to solve basic arithmetic problems in 5-10 seconds. For complex calculations, you should aim for 15-30 seconds. The key is accuracy under pressure, not just speed.
Focus on: percentage calculations, fraction operations, square numbers, and breaking down large numbers. These are the most commonly tested skills in quantitative trading interviews.
Practice daily with timed exercises, memorize common calculations, use visualization techniques, and practice under pressure to simulate interview conditions.