Marble Jar - Virtual Manipulative

Estimate and Count with Probability

A fun, visual way to practice estimation and subitizing skills using a jar of virtual marbles.

  • How to Use: Click the “Add” button to put marbles in the jar. Students estimate the count, then click “Reveal” to see the actual number.
  • Classroom Idea: Discuss “Likelihood”—if a jar has 10 red marbles and 2 blue ones, what is the probability of picking a blue one?

Marble Jar

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