A soroban (算盤, pronounced so-ro-ban) is the Japanese abacus: a wooden or plastic frame with vertical rods, a horizontal beam and sliding beads. It looks simple, yet it can represent any whole number and handle addition, subtraction, multiplication and division. In Japan it is still taught in many primary schools and in private soroban schools, and families around the world now use it to give children a concrete, visual way to understand numbers.
This guide explains what a soroban is, how its beads work, how it differs from other abacuses and what it can — and cannot — do for a child learning maths. You can follow every example on a real soroban or on our free virtual soroban.
The parts of a soroban
Every soroban has the same basic anatomy. Once a child can name these parts, instructions such as “push one earth bead up to the beam” become easy to follow.
| Part | Japanese name | Role |
|---|---|---|
| Frame | waku (枠) | Holds the rods and keeps the beads in place. |
| Rods | keta (桁) | Each rod is one place value: ones, tens, hundreds and so on. |
| Beam (reckoning bar) | hari (梁) | Separates upper and lower beads. Only beads touching it are counted. |
| Heaven bead (upper) | godama (五珠) | One per rod, worth 5 when pushed down to the beam. |
| Earth beads (lower) | ichidama (一珠) | Four per rod, each worth 1 when pushed up to the beam. |
| Unit dots | teiiten (定位点) | Dots on the beam, usually every third rod, mark where the ones place is. |
Student sorobans usually have 13 to 23 rods. Beginners rarely need more than three or four, but extra rods let them work with larger numbers later.
How to read numbers on a soroban
Start with a cleared soroban: all earth beads down, all heaven beads up, nothing touching the beam. This shows zero. Choose a rod with a unit dot as the ones rod; the rod to its left is tens, the next one hundreds.
On one rod, the value is simply 5 × (heaven bead on the beam) + 1 × (each earth bead on the beam). That gives one unique picture for every digit:
- 1 to 4: push up that many earth beads.
- 5: bring the heaven bead down; no earth beads.
- 6 to 9: heaven bead down plus 1 to 4 earth beads up (for example, 7 = 5 + 2).
- 26: tens rod shows 2 (two earth beads), ones rod shows 6 (heaven bead + one earth bead).
- 105: hundreds rod shows 1, tens rod stays empty (0), ones rod shows 5.
The empty tens rod in 105 is a good teaching moment: children see that zero is a real place holder, not “nothing”.
Two first calculations, step by step
Addition on a soroban always works from what is already on the rod. Two short examples show the main idea.
- 12 + 3 = 15: set 12 (one earth bead on the tens rod, two on the ones rod). Add 3 to the ones rod — there are only two earth beads left, so bring the heaven bead down (+5) and remove two earth beads (−2). The ones rod now reads 5: the answer is 15.
- 4 + 3 = 7: four earth beads are up, so you cannot push three more. Use the same move: heaven bead down (+5), two earth beads down (−2). The rod shows 5 + 2 = 7.
These moves use the “friends of 5” (3 + 2 = 5). Together with the “friends of 10”, they are the core of soroban arithmetic. Our guide to friends of 5 and friends of 10 covers every case.
A standard detail: the thumb pushes earth beads up, and the index finger pushes earth beads down and moves the heaven bead. Learning this early keeps movements fast and accurate.
A short history of the Japanese abacus
The soroban descends from the Chinese suanpan, which reached Japan around the 16th century. During the Edo period (1603–1868), merchants and the temple schools called terakoya made the abacus part of everyday commercial education.
Japanese makers gradually simplified the design. The Chinese abacus has two upper and five lower beads per rod; the soroban dropped the extra beads and, in the first half of the 20th century, settled on today’s 1-and-4 layout. With exactly one picture per digit, the soroban is quicker to read and suits the decimal system perfectly.
Electronic calculators replaced the soroban in offices, but not in education. Japan still runs graded abacus examinations (珠算検定), and soroban classes have spread to many other countries.
Soroban vs other abacuses
“Abacus” is a family of tools. Parents often meet three of them, and they are not interchangeable for teaching mental arithmetic.
| Tool | Beads per rod | Best for |
|---|---|---|
| Japanese soroban | 1 upper (5) + 4 lower (1) | Place value, fast calculation, transition to anzan. |
| Chinese suanpan | 2 upper (5) + 5 lower (1) | Traditional methods; some digits have several representations. |
| School counting frame | 10 beads per wire | Counting and early number sense for very young children. |
From beads to mental calculation: anzan
After months of regular practice, many learners begin to picture the soroban in their heads and move imaginary beads. This is called anzan (暗算), or mental abacus. Experienced students can add long lists of numbers this way without touching a physical tool.
Anzan should not be rushed. It works when the child already reads and moves beads automatically. Our article on when and how to introduce anzan explains the signs of readiness.
What the research says
The evidence is encouraging but specific. Frank and Barner (2012) showed that trained mental-abacus users represent numbers as visual images rather than words. A three-year randomised trial in India (Barner et al., 2016) found that mental-abacus instruction improved arithmetic for some children, especially those who started with stronger spatial working memory. It did not show broad gains in general intelligence.
So the honest promise is this: the soroban is a strong tool for understanding place value and practising arithmetic, and it can make maths feel more concrete and enjoyable. Claims about “photographic memory” or “whole-brain development” go beyond the evidence.
How to get started
You do not need a teacher or expensive equipment for the first steps:
- Explore the beads freely on the virtual soroban and practise showing numbers from 0 to 99.
- Follow the step-by-step learning path, which introduces one rule at a time.
- Add five to ten minutes of exercises or printable worksheets most days.
Conclusion
A soroban is a Japanese abacus with one bead worth 5 and four beads worth 1 on each rod. That simple design gives every digit one clear image, which makes place value visible and arithmetic hands-on. Used regularly and patiently, it can build accurate calculation and, for many learners, the ability to calculate mentally.
For a practical next step, read our parent’s guide to starting soroban at home.
Frequently asked questions
What is the difference between a soroban and an abacus?
The soroban is one type of abacus. Its 1-and-4 bead layout is specific to Japan; the Chinese suanpan uses 2 and 5 beads, and school counting frames use 10 beads per wire.
How do you count to 10 on a soroban?
Show 1 to 4 with earth beads, 5 with the heaven bead, and 6 to 9 with the heaven bead plus earth beads. For 10, clear the ones rod and push up one earth bead on the tens rod.
At what age can a child start the soroban?
Many children start between 5 and 7, once they can count to 10 and concentrate for a few minutes. See our guide to the best age to start soroban.
Is the soroban still useful when calculators exist?
Yes, as a learning tool. Its value is not replacing calculators but helping children understand numbers, place value and operations before they rely on a device.
Can I learn the soroban online for free?
Yes. Sorobany offers a free virtual soroban, a structured learning path, exercises and printable worksheets in four languages.