Numbers made visible
A bead. A place.
A reason to ask why.
Explore how numbers work—from five objects to whole numbers, fractions and signs—with The Ultimate Abacus.
Take your time. Ask questions. Use a hint when you need one.
Five objects. The word “five”. The symbol 5.
What connects them?
Your learning journey
Start with meaning.
Chapter 1
What does a number tell us?
Connect quantities, words, symbols and beads.
Chapter 2A few symbols. So many numbers.
Discover grouping, bases and positions.
Chapter 3Same digit. Different value.
Explore whole places, decimal fractions, zero and signs.
Chapter 4What happens when we calculate?
Understand operations and their connections.
Chapter 5Meet the frame.
Explore rods, stores, labels and movement.
Chapter 6Predict. Move. Explain. Check.
Work through arithmetic and check your reasoning.
Learn to Learn
Understanding begins
with a question.
Notice, predict, try and explain. Our lessons offer cues when you need them and invite you to check your own reasoning.
“A good teacher always looks for better ways to teach.”
— A. Amalanathan