Type any number and watch it build from blocks. See ones, tens, hundreds and thousands in color — with automatic regrouping!
Base ten blocks use small cubes for ones, rods for tens, flats for hundreds, and big cubes for thousands. Each block is worth exactly 10× the one below it.
When you get 10 ones, they regroup into 1 ten. When you get 10 tens, they become 1 hundred. This is exactly how adding and subtracting with carrying/borrowing works!
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