14 QUESTIONS · NO TIMER

Numbers & Estimation

Rates, percentages, and quantities that reward a second look.

Find the useful constraint

Write units next to numbers before combining them. A price per kilogram compares bags more fairly than package price alone. A rate per hour must be converted before multiplying by minutes. Percent changes use the current base, so an increase and an equal percentage decrease generally do not cancel. Estimating the scale before calculating can expose a misplaced decimal or an impossible result.

Slow down at the decision

Before choosing, restate what the question actually requires. Separate a condition that must hold from a detail that merely sounds familiar. Try each choice against the complete rule, rather than stopping at the first plausible answer. A counterexample can eliminate a confident guess faster than a long calculation. These rounds have no countdown: reading the explanation is part of the experience, not a penalty for a mistake.

A fair challenge

Each question provides its assumptions and has one intended answer. Pattern questions state their rules instead of asking you to guess an author's private pattern. Probability questions specify what is random and what information is known. Use the explanation to identify the exact step that changed your answer. Then try a fresh round; recognizing a principle in a different situation matters more than memorizing an answer letter.

YOUR NEXT FIVE

Can you figure these out?

Five puzzles. No timer. An explanation after every answer.

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