Number Line Ninja
Estimate, place, slice
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
- A number appears at the top. Click or tap the line where it belongs.
- The closer you land, the more points you score.
- 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.