Kumon’s Worksheet Empire

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In 1954 an Osaka high school maths teacher started writing worksheets for his son, who was struggling with arithmetic in second grade. The sheets were short, one page per day, and built so that the boy could work through them on his own. Seventy years later that method is a franchise network of more than 23,000 centres in over 60 countries and regions, with around 3.5 million subject enrollments. Kumon is one of Japan’s most successful exports, and one of the least discussed.

A father, a son and a page a day

Toru Kumon taught mathematics at a high school in Osaka. When his son Takeshi brought home a poor arithmetic test, Kumon looked at the textbooks and concluded they were not designed for learning alone. He began writing his own material: small steps, lots of repetition, and each page slightly harder than the last. Takeshi studied for about 30 minutes a day. By sixth grade he was solving differential and integral calculus.

Parents in the neighbourhood asked to use the same sheets. In 1958 Kumon founded the Osaka Institute of Mathematics to teach the method, and the first classroom opened in Moriguchi, a suburb of Osaka. The organisation became the Kumon Institute of Education and grew through word of mouth, with classes run by local instructors rather than salaried teachers. The first overseas centre opened in New York in 1974.

How the method works

Kumon is often described as tutoring, but it works differently. There is little lecturing. Students work through graded worksheets, and the instructor’s job is to set the right level and watch progress closely. The core principles have barely changed since the 1950s:

• Start below the comfort point — new students begin at a level they can complete easily, to build speed and confidence
• Small steps — each sheet adds only a little new content, so students can teach themselves from worked examples
• Daily practice — short sessions every day, two in the classroom and the rest at home
• Mastery before moving on — students repeat material until they can complete it accurately within a target time
• No grade ceiling — students are encouraged to study above their school year, and many do

The approach has critics, who argue that drilling favours speed over understanding. Supporters counter that the method was never meant to replace school, only to build the calculation fluency and study habits that make school easier. Either way, the design has one clear business advantage: it scales without needing highly trained teachers.

A franchise built on local instructors

Kumon’s growth model is the franchise. Each centre is run by an independent instructor, often a parent or former teacher, who pays fees to Kumon and receives the worksheets, training and brand. The instructor does not need to be a subject expert at advanced levels because the material itself carries the teaching. Historically, many instructors in Japan have been women who opened classes in their own homes or local community halls, which let Kumon expand into small towns that no cram school chain would reach.

The model travels well. In North America, Kumon regularly ranks at or near the top of franchise rankings in the education and tutoring category, and in 2025 it again reported enrollment growth there. In much of Asia, the name “Kumon” is used almost as a generic word for after-school worksheet practice.

Kumon by the numbers

Kumon is unlisted, but it publishes an annual report. For fiscal 2025 the group reported:

Two trends stand out. First, overseas is now the growth market: enrollment outside Japan rose while total enrollment slipped slightly, reflecting Japan’s shrinking number of children. Second, Kumon is moving its worksheets onto tablets. Its digital format, Kumon Connect, had about 264,000 overseas students in 2025, up nearly 40% year on year, and covers more than 80% of eligible overseas centres. In Japan, digital enrollments grew about 45% to roughly 52,000. The paper worksheet remains the brand symbol, but the delivery is changing fast.

Beyond children

The same logic of short, daily, achievable tasks has taken Kumon into unexpected areas. Since 1977 it has supported education programmes in correctional facilities. In the 2000s it developed Learning Therapy with brain researchers at Tohoku University: simple reading-aloud and arithmetic exercises for older adults, used in care homes across Japan to help maintain cognitive function in people with dementia. For a country where the elderly outnumber children by a wide margin, that is a logical extension of a company whose home market is shrinking at the other end.

What it means for overseas partners

• Franchise investors — Kumon is a proven low-capital franchise model with standardised materials and strong brand recognition in North America, Asia and increasingly the Middle East and Africa.
• EdTech companies — the shift to Kumon Connect shows how a paper-based method can be digitised without losing its structure; partners in handwriting recognition, learning analytics and tablet hardware have a large installed user base to work with.
• Elderly care operators — Learning Therapy is a ready-made programme for cognitive maintenance that can be licensed into care homes in other ageing markets.

Conclusion

Kumon’s strength is that it never tried to be a school. It built a single, narrow tool — a worksheet that a child can finish alone in a few minutes — and then a franchise system that lets almost anyone deliver it. That simplicity carried a father’s homework project from Osaka to more than 60 countries. As Japan’s own pool of children shrinks, the company’s future depends on overseas growth, tablets and, perhaps, the older learners it began serving two decades ago.