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?