Numerical Reasoning5.5 min timed session
Digit Challenge
Fill in blank equation slots with numbers 1–9 to satisfy the target mathematical outcome.
Launch Digit Challenge simulatorAdaptive staircase calibration
Difficulty scales dynamically from Level 1 to 25 based on response precision and speed. Correct answers advance difficulty (+1 level); mistakes drop difficulty (-1 level) to measure your cognitive ceiling.
Benchmark accuracy
Complete at least 6 questions in a full timed session with ≥75% accuracy to unlock higher difficulty baselines and persist high-water marks.
Assessment rules and guidelines
- 1An equation with blank slots (_) and arithmetic operators (+, -, ×, ÷) is displayed on screen.
- 2A target result is shown on the right side of the equals sign.
- 3Tap or type digits 1–9 into the blanks in order from left to right.
- 4Digits may be repeated across blanks. Any combination equaling the target is accepted.
- 5Press the Lock button to submit your equation, or Trash to clear.
Strategy and pacing
- Look at the final operator before the equals sign to estimate ballpark values.
- For multiplication and division slots, consider factors of the target.