Enter any number and see every way to split it into two parts. Click any bond to see it in the diagram!
A number bond shows how a whole number is made up of two parts. For example, 10 can be split into 7 and 3, or 5 and 5, or 8 and 2. Understanding all the ways to make a number builds mental math fluency.
The big box at the top is the whole. The two boxes below are the parts. Click any bond in the grid to see it displayed in the diagram!
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