60-Second Estimation Test

Round, or estimate by rounding each number to its first digit. Answer with the exact result of the rounded calculation (48 × 21 → 1,000). Your personal best is saved on your device only.

How scoring works

• Correct answers are the headline number — speed that sacrifices accuracy is not speed.
• Questions per minute measures raw fluency.
• Points = 10 per correct answer + an accuracy bonus, so guessing doesn't pay.

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