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Quantity Estimate

Compare two briefly shown groups of dots across 12 choices. Pick the larger quantity, reveal the real counts and review your accuracy.

Math2–4 minFree to play
—Your personal best

Play Quantity Estimate

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How to play

  1. Prepare for a quick look

    Start round shows two dot groups for 1.5 seconds. Each pair has one group with more dots; there are no ties.

  2. Choose after they hide

    When the dots disappear, choose Left had more or Right had more. The left and right arrow keys also answer when the game is focused. There is no answer deadline.

  3. See the real counts

    The dots return with both quantities. Read the feedback, then choose Next pair when ready.

  4. Finish the set

    The quantities get closer over three groups of four questions. Complete all 12 to save and review the round.

Inside the game

What is Quantity Estimate?

Quantity Estimate is a short visual comparison game. Each complete run has six larger-left and six larger-right pairs in shuffled order. Questions alternate equal-sized dots and dots adjusted to give both groups the same total dot area. The larger group contains 24–36 dots, while the smaller group moves from about half as many toward four-fifths as many. Spacing and occupied area may still provide visual cues; this is a game, not a standardized number-sense test. It requires visual observation.

How your score works

Each correct answer earns one point, up to 12, with no speed bonus. The saved result is correct answers; accuracy and the individual counts appear in the review. Observation lasts 1.5 seconds, but answering is untimed. Losing page focus or switching tabs cancels the current pair; Try a fresh pair keeps the same question number and difficulty without recording a miss. Only a finished 12-question run saves.

More about your scores →

Example: more dots, not bigger dots

If the left field has 18 dots and the right has 30, choose Right. On some pairs the 18 dots are larger, so both fields have the same total dot area. The correct choice still depends on count.

Playing tips

  1. Use the feedback to recalibrate

    After answering, both fields return with exact counts. Look at how the difference appears before moving to the next pair. The final four pairs have closer quantities than the first four.

  2. Take in both groups

    Compare the two groups as a whole instead of counting individual dots.

  3. Look beyond size

    Dot size varies: larger dots do not always mean a larger quantity.

  4. Set your own pace

    Take a moment between pairs. The next brief observation starts only when you ask for it.

Questions, answered.

Results describe this game session. They are not IQ scores, diagnoses or clinical assessments.

The 1.5-second view makes this an estimation task. Answer after they hide, then inspect the real counts in the feedback.

The current pair is canceled without a score. Return and choose Try a fresh pair to see a new arrangement at the same difficulty. Completed answers remain in this run.

No. Every pair has one strictly larger quantity, and every complete round balances the larger side six times each.

A little more to explore.

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