Math Questions at Visa: What to Expect

Math questions at Visa aren't about abstract theory—they are a direct test of your analytical precision and logical reasoning under constraints. In the domains of payment processing, fraud detection, and financial data systems, a single miscalculation or flawed probabilistic model can have significant real-world consequences. The 15 math-focused questions in their technical assessment (out of 124 total) serve as a filter for candidates who possess the numerical fluency and structured problem-solving required to build and validate reliable financial systems.

What to Expect — Types of Problems

The math questions typically fall into a few key categories, blending pure calculation with algorithmic thinking.

• Probability & Statistics: These are central to risk and fraud modeling. Expect questions involving basic probability (coins, dice, cards), conditional probability, combinatorics (permutations and combinations), and descriptive statistics (mean, median, standard deviation).
• Modular Arithmetic & Number Theory: Crucial for hashing, cryptography, and cyclic operations. Problems often involve remainders, divisibility rules, greatest common divisor (GCD), and operations within a fixed modulus.
• Sequences, Series, and Progressions: Identifying patterns in numerical sequences (arithmetic, geometric) or summing series efficiently tests your ability to derive formulas over iterative processes.
• Basic Algebra and Word Problems: Translating a worded financial or operational scenario into equations and solving for unknowns. This tests your ability to abstract a real problem into a mathematical model.

How to Prepare — Study Tips

1. Revisit Fundamentals: Solidify core concepts from probability, combinatorics (nCr, nPr), and modular arithmetic. Don't just memorize formulas—understand why they work.
2. Practice Mental Math & Estimation: Speed and accuracy with percentages, fractions, and exponents are essential. Practice without a calculator to build confidence.
3. Translate Words to Math: For every word problem, identify the unknowns, constants, and relationships before writing any code. Define your variables clearly.
4. Code the Solution Efficiently: Once the math is clear, implement it with optimal time and space complexity. Often, a direct formula is better than a simulation.

A common pattern is using the GCD to solve problems about cycles, partitioning, or finding common divisors. Here’s how you might implement it:

def gcd(a, b):
    while b:
        a, b = b, a % b
    return a

# Example: Find if two gears with a and b teeth will ever return
# to their initial alignment in less than 100 rotations.
def gears_aligned(a, b, max_rotations):
    lcm = abs(a * b) // gcd(a, b)  # Use GCD to find LCM
    return lcm <= max_rotations

Recommended Practice Order

1. Start with core Number Theory (GCD, LCM, modular arithmetic).
2. Move to Combinatorics & Probability, ensuring you can differentiate between permutations and combinations.
3. Practice Sequence and Series problems, looking for closed-form formulas to avoid loops.
4. Integrate all skills by solving word problems that mimic financial scenarios.
5. Finally, time yourself on mixed problem sets to simulate the actual test pressure.

Practice Math at Visa