Soroban-based calculation practice

Practice mental arithmetic with interactive exercises

Short sessions at your own pace, on any supported device

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Calculation practice

Learners work through addition and subtraction sequences, enter a total, and receive immediate feedback.

Short interactive sessions

Each exercise presents numbers one by one, with optional voice and a visual review of the full sequence.

Control and independence

The learner chooses an available curriculum topic and practices at a clear pace with exercises from the active program.

Mental arithmetic with a visualized soroban

The soroban, or abacus, is a counting frame used for arithmetic. In soroban-based training, learners first practice physical bead movements and may later use a mental image of the frame to calculate.

Traditional wooden soroban on a light background with sakura petals

For adults

Adults can use short sessions to practice arithmetic sequences, choose the pace, and review each answer.

For children

Children can work through structured addition and subtraction exercises, hear or view each number, and receive immediate feedback.

3 steps to start practicing

Step 1: Learn the rule

Choose an available curriculum topic that matches your skills.

Step 2: Focused practice

A short session presents one calculation sequence at a time at the selected pace.

Step 3: Learn from feedback

After each answer, the learner sees the result and can review the sequence before continuing.

Tools for group or independent practice

Structured curriculum

Choose from topics available in the active curriculum.

Focused practice sessions

Work through short generated sequences with a clear beginning and completion.

Immediate feedback

See whether each answer is correct and continue in the same exercise.

Works in the browser

Practice on a supported tablet, laptop, or smartphone without installing an app.

What research has examined

Child DevelopmentA three-year randomized classroom trial reported gains on arithmetic tasks but no change in basic cognitive abilities.Journal of NeuroscienceA five-year child study reported stronger arithmetic and visuospatial working-memory performance, found no difference in general intelligence, and called for further research.

Studies have examined mental-abacus training, especially arithmetic and visuospatial working memory. Their findings vary by design, duration, population, and outcome, and do not establish broad improvements in intelligence or general cognitive ability.

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