Flash Anzan is a mental math drill where numbers flash briefly on a screen one after another. You add them in your head (often using an imaginary abacus or soroban) and enter the total when the sequence ends.

How do I use this Flash Anzan trainer?

Choose digits per number, flash speed, and how many numbers to show, then press Start. Watch the flashes, add them mentally, and type the total. Optionally record your session with your camera to review or share.

FLASH ANZAN

Q: Is Flash Anzan free on SumoMath?

Yes. This Flash Anzan tool on SumoMath.com is free to use in your browser with no download required.

Q: What settings can I change?

You can set 1–5 digits per number, flash speeds from 0.1 to 3.0 seconds, and sequences of 5 to 100 numbers. You can also turn session recording on or off.

Numbers flash. Add them in your head. Enter the total.

Digits per Number

Speed (seconds)

Numbers to Display

Record a video of yourself

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Your answer: —

Correct answer: —

What is Flash Anzan?

Flash Anzan is a mental arithmetic drill made popular by abacus (soroban) students. Numbers appear on screen for a fraction of a second. You add them in your mind—often visualizing beads on an imaginary abacus—and report the sum when the sequence ends.

How this trainer works

Pick digits per number (1–5), flash speed (0.1–3.0s), and how many numbers to show.
Press Start. After a ready–set–go countdown, numbers flash one by one.
Enter the total. Optionally record yourself with your camera to review form or challenge a friend.

Why practice Flash Anzan?

Short, intense drills build working memory, focus, and mental calculation speed. SumoMath’s free Flash Anzan tool runs in your browser—no app install required—so you can train on phone or desktop anytime.

Want to really learn mental math?

If you want to go beyond a single drill and truly learn mental math, SumoMath is a free program. Register at www.sumomath.com to get started with structured training, including anzan, flash practice in many languages, audibles, and soroban.

Related free tools

Number to Bead — see or hear a number, then set it on a soroban
Bead to Number — read a flashing bead pattern and enter the number

Common questions

Is Flash Anzan free on SumoMath? Yes. This tool is free in your browser — no download required.

What settings can I change? Digits per number (1–5), flash speed (0.1–3.0s), sequences of 5–100 numbers, and optional camera recording.