Math

Race through arithmetic. Addition, subtraction, multiplication, and more.

Calculate percentages, discounts, and markups in your head.

Master fractions: convert, add, subtract, multiply, and divide.

Master PEMDAS with expressions that punish left-to-right guessing.

Multi-digit mental multiplication under time pressure.

Watch prices flash by. Estimate the total.

Estimate square roots to the nearest hundredth.

Estimate logarithm values in different bases.

Estimate powers and exponentials from memory.

Estimate ratios and proportions from given quantities.

Powers, squares, cubes, and square roots. Mental math fundamentals.

Find primes, count primes, and master number theory.

Find the pattern and predict the next number in the sequence.

Convert between scientific notation and standard form.

Calculate greatest common divisors and least common multiples.

Calculate the average (mean) of a dataset. Mental arithmetic meets statistics.

Find the middle value in a dataset. Sort, locate, calculate.

Calculate the population standard deviation of a dataset.

Calculate probabilities for dice, coins, cards, and more.

Factorials, permutations, and combinations.

Calculate and interpret z-scores in normal distributions.