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2xKit

Estimation Challenge

Round and add fast — get within 5 of the exact total.

Runs in your browser

How to use this

  1. 1Click "Start" to begin the Estimation Challenge timer.
  2. 2Round the numbers shown and type your best estimate of their sum, then press Enter or click Submit.
  3. 3Keep answering until the timer runs out — each correct answer adds to your score.
  4. 4Your best score is saved automatically so you can try to beat it next round.

Frequently asked questions

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