What is it?
The Number Rack facilitates the natural development of children's number sense. The movable, colored beads encourage learners to think in groups of fives and tens, helping them to explore and discover a variety of addition and subtraction strategies.
How it works
Subtract or add a row of beads. You can display up to 10 rows (100 beads).
Display a shade for hiding beads.
Hide the shade.
Start over. Moves all the beads to the left.
Drag the shade to move it.
Drag the bottom corners to change the size of the shade.
About the Number Rack.
For more Number Rack resources including free lesson plans see:
To learn about Bridges in Mathematics, an elementary curriculum that employs visual models like the Number Rack, please visit:
This resource is brought to you by The Math Learning Center, a nonprofit organization dedicated to K-12 education since 1976. The Number Rack app was made possible by a generous donation from Dr. David Moursund.
This app was crafted by Clarity Innovations. We help
improve teaching and learning by creating solutions that
match promising technologies with the needs of education.
Visit us: www.clarity-innovations.com