Watch addition and subtraction become hops on a line. Place fractions, explore negatives, see numbers in sequence!
A number line is a straight line where every point corresponds to a number. Numbers increase going right and decrease going left. It's one of the most powerful tools for understanding how numbers relate to each other.
Each hop forward (→) is addition. Each hop backward (←) is subtraction. Switch to the Fractions range to see 1/2, 1/4, and 3/4 as points between 0 and 1.
This free interactive math tool helps students visualize and understand mathematical concepts. Instead of memorizing procedures, students can see how numbers work through visual models, manipulatives, and step-by-step animations. Research shows that visual learning in math leads to deeper conceptual understanding.
All math tools on SmartOnlineGames are aligned with Common Core State Standards for Mathematics and are designed for students in grades K through 8. They are completely free, require no login or account creation, and work on any device including tablets, Chromebooks, and interactive whiteboards.
Interact with the visual tool above to explore the concept. Try different inputs and observe how the output changes. Teachers can use this tool for whole-class demonstrations or independent practice. Parents can use it for homework help or math enrichment at home.
Last reviewed: April 2026