Understand the abacus. Check the homework. Watch them master it.
Type in any problem and see it solved bead by bead — the way the class teaches it. Then let your child practice where they have to actually solve, not just peek at the answer.
Tap the beads — the number updates live.
📖 Learn from zero
History, the 7 types, and interactive lessons on reading beads and the “friends” tricks.
✅ Verify instantly
Parents & teachers check a full worksheet in seconds — with the steps explained.
🎯 No-cheat practice
Kids solve randomly generated problems and flash-anzan drills. No “show answer”.
A short history of the abacus
The oldest calculator humans ever built — and still one of the best for training young minds.
Ancient counting boards
Sumerians and Babylonians used lined boards and pebbles (“calculi” — the root of the word calculate) to track numbers.
The Roman hand abacus
A portable grooved metal board with sliding markers — the pocket calculator of the ancient world.
The Chinese suanpan
The familiar bead frame (2 top, 5 bottom) spread across Asia for trade and accounting.
The Japanese soroban
Streamlined to 1 top + 4 bottom beads — faster, and the standard used in mental-math programs today.
Brain training
Programs like Best Brains, UCMAS and Aloha use the soroban to build focus and lightning mental arithmetic in children.
Two hands, two hemispheres
Moving beads turns abstract numbers into a physical, visual picture kids can later “see” in their heads.
The 7 types of abacus
Same idea — beads standing in for numbers — in seven forms from around the world.
How to use a soroban
Four short lessons. Play along on the live abacus.
Parts of the abacus
A quick tour before the lessons.
Parents & teachers
Check any answer, understand the steps, and print practice sheets with answer keys.
Answer checker
Enter a problem the way the worksheet shows it, e.g. 7 + 5 - 3 + 4.
Worksheet generator
Kids zone
Solve it yourself — there's no answer to peek at! Earn stars and streaks.