A number is shown — click where it belongs on the number line. Tests how accurately your brain represents numbers spatially. Based on Siegler & Opfer (2003) research on the mental number line.
Very Easy
Number line 0–10 · 10 trials · integers
Easy
Number line 0–20 · 12 trials · integers
Medium
Number line 0–100 · 15 trials · integers
Hard
Number line 0–1000 · 18 trials · multiples of 10
Expert
Number line 0–10000 · 20 trials · multiples of 100
Scientific Background
Based on: Number Line Estimation Task (Siegler & Opfer, 2003; Booth & Siegler, 2006) (Siegler et al., 2003)