Number Line Ninja

About Number Line Ninja

Drop a marker on the number line where the number belongs. Works with whole numbers, fractions, decimals and negatives.

Ankhdase tracks 5 distinct skills in Number Line Ninja, including Number line & estimation, Comparing numbers, Rounding and Decimals. Because mastery is estimated per skill rather than per game, the questions shift toward whatever a student is getting wrong — and away from what they have already proved they know.

There are 4 modes to choose from: Whole numbers, Fractions, Decimals and Negatives.

How to play

1. A number appears at the top. Click or tap the line where it belongs.
2. The closer you land, the more points you score.
3. After each go you see exactly where it should have gone.

Skills Number Line Ninja practices

• Number line & estimation
• Comparing numbers
• Rounding
• Decimals
• Negative numbers

Mastery is estimated separately for each of these, which is what lets the difficulty move independently — a student can be fluent on one and still be fed easier questions on another.

Questions about Number Line Ninja

Is Number Line Ninja free to play?

Yes. Number Line Ninja is free, runs in any modern browser, and needs no download or plugin. You can play straight away without an account; signing in is only needed if you want progress, streaks and badges saved.

What age is Number Line Ninja for?

Number Line Ninja suits ages 5–13 — roughly Kinder to Grade 7+. The difficulty adapts as you play, so it stays useful across that whole range rather than being pitched at one year group.

What does Number Line Ninja teach?

It practices Number line & estimation, Comparing numbers, Rounding, Decimals and Negative numbers. Every question is tagged with the skill it exercises, so progress is tracked skill by skill rather than as one overall score.

Does Number Line Ninja work on a tablet or phone?

Yes. Number Line Ninja works with touch as well as a mouse, and every drag action has a tap-to-select alternative. Once the page has loaded once it also keeps working offline.

Can teachers assign Number Line Ninja?

Yes. Teachers can create a class, add students in bulk without email addresses, and set Number Line Ninja as an assignment with a goal — a score, a number of minutes, stars or a typing speed. Progress updates automatically as students play.