Numerical foundation

Create time for the hard part.

Reliable arithmetic frees attention for probability, strategy and communication under interview pressure.

Training sequence

Progress through addition, multiplication, division, squares, powers, roots, fractions, percentages, ratios, weighted averages, sequences and estimation.

Speed comes after a clean method. Learn the decomposition untimed, then shorten the clock without sacrificing accuracy.

Desk habits

  • Anchor percentages on 10%, 5% and 1%.
  • Decompose products around round bases.
  • Keep common fractions and powers available from memory.
  • Sanity-check the order of magnitude before submitting.

Mental Math Arena

Use short sprints for speed, accuracy mode for repair and mixed screening sessions for decision-making under a clock. These drills are preparation formats, not reproductions of proprietary tests.

Start with five focused minutes.

The generator creates fresh values so progress comes from method, not answer memory.

Open the arena