K
Kani Math
Cosmic Abacus
Launch App →
Free training tool

Flash anzan practice

Numbers flash one at a time — hold the running total on your mental abacus and type the answer. Pick the bead rule you want to drill and every card is built around it.

Start flashing ↓
⚡ 10 flash cards · one fixed speed🎁 Free — no sign-up, no download.
Provably on-rule
A bead-engine oracle checks every sequence, so a big-friends card really drills big friends — at least 4 of the 10 moves.
Real flash pacing
A steady rhythm with a clean blank beat between numbers, just like classroom flash anzan.
Free and instant
No account, no download, nothing to install — it runs right here in your browser.
How it works

Built for real anzan practice

  1. 1
    Pick a rule
    Direct moves, small friends, big friends, or combinations — every card is built around your pick.
  2. 2
    Watch the flashes
    The numbers appear one at a time. Add and subtract them on the abacus in your head.
  3. 3
    Type the total
    Answer after each card and get an instant recap of the whole sequence.

What do you want to drill?

Rows

10 flash cards · one fixed speed

Flash anzan is the classic mental-abacus exercise: numbers appear briefly one after another, and you add or subtract each one on the abacus you picture in your head. It trains the jump from moving real beads to pure visualization — the skill behind the famous calculation speed of abacus students.

This trainer is rule-targeted. Choose direct moves, small friends (5-complements), big friends (10-complements) or the combination rules, and the generator builds every sequence so your chosen rule keeps coming up — checked by the same engine that powers our Bead Checkup.

New to mental abacus?Read the anzan walkthrough — how students move from real beads to a picture in the head.

Common questions

What is flash anzan?
Numbers appear one at a time, each for a fraction of a second, and you hold the running total in your head — there is nothing to write on and nothing left on screen to look back at. It is the competition form of mental abacus: the child pictures the beads moving and reads the answer off the imagined frame at the end.
How is this different from the flash anzan drill in the app?
This one is rule-targeted. You pick a bead rule and every card is built so that rule actually fires; the app’s drill gives you speed and digit-width controls instead. Use this page when a check has told you which rule is weak, and the app when you want to push pace or size.
Does the rule I pick really appear in the numbers?
Yes. Sequences come from the same trace-checked generator the Bead Checkup uses, which replays each addition bead by bead and rejects any card where the chosen rule does not fire on at least four of the ten moves. A sequence that merely permits the rule is not good enough.
My child can do the arithmetic but not at this speed. Is that normal?
Yes, and it is the wrong thing to fix first. Flash anzan is a speed test laid on top of a skill; if the skill is shaky the speed only hides which part broke. Work the rule on paper or on a frame until it is automatic, then come back — the pace stops mattering surprisingly quickly.
Can I change the speed or the number of digits?
Not here. This page runs a fixed five cards of ten single-digit numbers so the rule stays the only variable. Speed, digit width, row count and multi-digit flash live in the Kani Math app, which also remembers scores between sessions.
See all questions →