Where should I start with flash anzan?

Start with an easy setting such as 1 digit, 3 numbers, 6 seconds (2 seconds each). Once you can answer reliably, increase the count to 5 and then 10, and only then shorten the time. The “Level challenge” arranges 20 steps from 1 digit × 3 up to 3 digits × 15 in 3 seconds and moves you up automatically when you answer correctly.

How should I choose the seconds?

The seconds you enter are the time to show all the numbers. For example, 10 numbers in 5 seconds switches every 0.5 seconds. “Seconds per number” is shown below the settings, so shorten it little by little while watching that.

Can I practice problems with subtraction?

Yes. Set the operation to “Addition & subtraction” and numbers to subtract are shown in red with “−”. Problems are made so the running total never goes negative, so they can be done on an abacus too.

What is listening arithmetic (yomiagezan)?

It is abacus practice where you calculate by listening to the problem read aloud instead of seeing it. In Japanese classes it is read like “Negaimashite wa, 123 yen nari, 456 yen nari, … 789 yen de wa”, with “hiite wa” before numbers to subtract. This tool reads the numbers aloud in a similar style using speech synthesis, at a speed of 0.8× to 2×.

Can I see where I went wrong?

After checking, a table shows the numbers and the running totals (from the first number up to each one). If your answer matches one of the running totals, it says “same as the total up to number N”, so you know you missed the numbers after that. You can redo the same sequence with “Same problem again”.

Can I practice under the same conditions as an abacus exam?

Under “Free settings” you can freely combine digits (1–4), count (2–30), and seconds (0.5–60) to match your target. Note that the 20 levels of the level challenge are this tool’s own guide and don’t correspond to exam grades.

Can I use it on a phone or tablet?

Yes. The answer field brings up a numeric keyboard, and the “Full screen” button shows just the numbers large. No app installation or sign-up is needed.

Flash Mental Math (Flash Anzan) & Listening Arithmetic Trainer | Set Digits, Count & Seconds Freely

A tool for abacus and mental arithmetic practice with flash anzan and listening arithmetic (yomiagezan). Freely combine 1–4 digits, 2–30 numbers, and 0.5–60 seconds, with addition only or mixed addition and subtraction. When checking, it lists the numbers shown and the running totals, and tells you whether your answer matches “the total up to number N”, so you can see where you missed. Also includes a 20-level challenge (up on a correct answer, down after two misses in a row), a beep, full screen, and retrying the same problem. Listening mode reads the numbers aloud with your browser’s speech synthesis.

ABOUT

About Flash Mental Math (Flash Anzan) & Listening Arithmetic Trainer | Set Digits, Count & Seconds Freely

This flash mental math and listening arithmetic trainer lets you practice abacus-style mental arithmetic in your browser, at an abacus school or at home. In flash mode, choose the digits (1–4), the count (2–30), and the total seconds, and numbers appear on screen one at a time. Besides addition, you can make mixed addition and subtraction problems where the running total never goes below zero. In listening mode, your browser’s speech synthesis reads the numbers aloud, Japanese-abacus-class style, and marks numbers to subtract. When checking, it lists the numbers shown and the running totals and tells you which running total your answer matches, so you can see where you missed. It also has a 20-level challenge that moves up on correct answers, a beep, full screen, and retrying the same problem.

How to use Flash Mental Math (Flash Anzan) & Listening Arithmetic Trainer | Set Digits, Count & Seconds Freely

1Choose “Flash mental math” or “Listening (audio)”
2Under “Free settings”, choose digits, count, seconds, and addition only or addition & subtraction (or pick a level under “Level challenge”)
3Press “Start” and add up the numbers in your head as they appear after 3-2-1 (or as they are read aloud)
4When all numbers are done, enter your answer and press “Check”
5Use the table of numbers and running totals to see where you went wrong
6Continue with “Next problem” or retry with “Same problem again”

Great for

Practice flash anzan at home as abacus school homework
Start with your child on easy settings like 1 digit, 5 numbers, 5 seconds
Gradually shorten the time to match a target such as 2 digits × 10 or 3 digits × 15
Get used to mixed addition and subtraction problems
Practice listening arithmetic without a teacher
Show it full screen on a tablet or TV for a class or the family
Use the daily level challenge as brain training for adults
Look back at which number you missed when you get it wrong

Good to know

Each number is shown and then followed by a short blank. About 72% of each interval is display and the rest is blank, so repeated numbers are still distinguishable (the same number is never shown twice in a row anyway).
Seconds per number = total seconds ÷ count. To keep up with screen refresh, settings faster than 0.1 seconds per number aren’t allowed.
With 2 or more digits, numbers ending in 0 (10, 20, 300, etc.) are not used. With 1 digit, 1–9 are used.
In addition & subtraction mode, the first number is always added and the running total never goes negative. At least one number is subtracted. Numbers to subtract are shown in red with “−”, with a slightly lower beep.
Listening mode uses your browser’s speech synthesis (Web Speech API), so it reads with a voice installed on your device in the language you are viewing. The voice and how numbers are read vary by device. It isn’t available in browsers without speech synthesis.
The 20 levels are this tool’s own guide and don’t match the grades of official abacus or mental arithmetic exams. If you are taking an exam, practice with the conditions published by the organization (you can set the same digits, count, and seconds under Free settings).
Levels and history are saved only in this browser (localStorage) and never sent to a server. A share URL contains only the settings (or level), and a new problem is made each time it opens.

Questions this tool answers

Use Flash Mental Math (Flash Anzan) & Listening Arithmetic Trainer | Set Digits, Count & Seconds Freely for searches like these:

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FAQ

Where should I start with flash anzan?: Start with an easy setting such as 1 digit, 3 numbers, 6 seconds (2 seconds each). Once you can answer reliably, increase the count to 5 and then 10, and only then shorten the time. The “Level challenge” arranges 20 steps from 1 digit × 3 up to 3 digits × 15 in 3 seconds and moves you up automatically when you answer correctly.
How should I choose the seconds?: The seconds you enter are the time to show all the numbers. For example, 10 numbers in 5 seconds switches every 0.5 seconds. “Seconds per number” is shown below the settings, so shorten it little by little while watching that.
Can I practice problems with subtraction?: Yes. Set the operation to “Addition & subtraction” and numbers to subtract are shown in red with “−”. Problems are made so the running total never goes negative, so they can be done on an abacus too.
What is listening arithmetic (yomiagezan)?: It is abacus practice where you calculate by listening to the problem read aloud instead of seeing it. In Japanese classes it is read like “Negaimashite wa, 123 yen nari, 456 yen nari, … 789 yen de wa”, with “hiite wa” before numbers to subtract. This tool reads the numbers aloud in a similar style using speech synthesis, at a speed of 0.8× to 2×.
Can I see where I went wrong?: After checking, a table shows the numbers and the running totals (from the first number up to each one). If your answer matches one of the running totals, it says “same as the total up to number N”, so you know you missed the numbers after that. You can redo the same sequence with “Same problem again”.
Can I practice under the same conditions as an abacus exam?: Under “Free settings” you can freely combine digits (1–4), count (2–30), and seconds (0.5–60) to match your target. Note that the 20 levels of the level challenge are this tool’s own guide and don’t correspond to exam grades.
Can I use it on a phone or tablet?: Yes. The answer field brings up a numeric keyboard, and the “Full screen” button shows just the numbers large. No app installation or sign-up is needed.

Special Thanks

SOLO GUILD | サービス作るAIエンジニア

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