Estimator

A swarm of dots flashes for a heartbeat — no time to count. Guess how many. Trains your approximate number sense, the gut feel for quantity that underlies fast mental math.

Trains: Number sense · Category: Attention & Speed

How to play: Estimator is a free, browser-based brain-training game in the Brain Gym suite. Play it instantly — no sign-up, works offline, and your best scores are saved on your device.

Play Estimator · All Brain Gym games