Number Line: a math estimation game for kids

A number appears above a line, and your child taps where it belongs. It starts on a 0–10 line with tick marks to help.

This trains number estimation — understanding how big numbers are compared to each other, a known predictor of early maths.

Next come 0–20, then 0–100 with only the ends marked, then 0–1000, and at the top levels fractions and decimals on a 0–1 line.

How to play

1. Look at the big number.
2. Tap the line where you think it goes. You can drag to fix it.
3. Tap ✅ and watch the frog hop to the right spot!

Why it helps

• Practises estimating where numbers belong
• Builds a mental number line
• Supports place value and fractions
• Part of the monthly check-up

Based on the number-line estimation task, studied as a predictor of early maths. Grown-ups can see “Average miss (% of the line)”.

💡 Use a tape measure or a ruler: call out a number and guess where it is before checking together.