Abacus
Master the soroban abacus from scratch! 20 structured lessons covering counting, place value, small friends (complements of 5), big friends (complements of 10), and mental arithmetic. Interactive abacus simulator, speed drills, flash anzan, and quizzes.
Duration
40 hours
Lessons
20
Students
1
One-time payment
Lifetime access
3 free demo lessons
Certificate of completion
Expert instructor support
What You'll Learn
Course Curriculum
Meet the Abacus
Learn the parts of a soroban abacus — frame, rods, beam, earth beads, and the heaven bead.
Counting 1 to 4
Use earth beads to count from 1 to 4 on a single rod.
The Heaven Bead
Discover the heaven bead (worth 5) and learn to show numbers 5 to 9.
Place Value
Understand ones, tens, and hundreds rods. Set two-digit and three-digit numbers.
Simple Addition
Add single-digit numbers by pushing beads toward the beam.
Simple Subtraction
Subtract by pulling beads away from the beam.
Adding to Ten
Perform multi-step additions and keep a running total on the abacus.
Two-Digit Operations
Add and subtract two-digit numbers across multiple rods without carry or borrow.
Meet the Small Friends
Learn number pairs that make 5: the foundation for heaven bead operations.
Small Friends Addition
Add using the heaven bead when earth beads aren't enough.
Small Friends Subtraction
Subtract using the heaven bead with the complement technique.
Small Friends Practice
Mixed drills combining direct moves and small friend techniques.
Meet the Big Friends
Learn number pairs that make 10: the key to carrying and borrowing.
Big Friends Addition
Add with carry: add 10 to the next rod and subtract the big friend.
Big Friends Subtraction
Subtract with borrow: take 10 from the next rod and add the big friend.
Combined Friends
Master problems that require both small and big friend techniques.
Multi-Digit Operations
3-digit addition and subtraction with carries across multiple rods.
Speed Calculation
Timed drills to build calculation speed and automatic technique selection.
Mental Abacus
Begin anzan — calculate by visualising the abacus in your mind with flash anzan training.
Abacus Champion
Final assessment covering all levels. Mixed problems, speed test, and celebration!