# Math quiz / Calculator quiz — Measure your concentration.

> Measure your concentration. (iPhone/iPad app by hideo nakamura.)

- Source: https://appshunter.io/ios/app/math-quiz-calculator-quiz/id6738276121 (this page in markdown: same URL + `.md`)
- Developer: [hideo nakamura](https://appshunter.io/developer/1242808811)
- Category: Games, Education, Family, Puzzle
- Price: $0.99
- Age rating: 4+
- Requires: iOS 14.4 · 2 MB
- Languages: American English, Japanese
- Released: 2024-11-28
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/math-quiz-calculator-quiz/id6738276121/reviews.md

## What is Math quiz / Calculator quiz?

This is a game where you solve calculation problems displayed on the screen.
Try playing it once.
You will find out your abilities.
You have 3 minutes, and your time will decrease as time passes.
If you answer correctly quickly, your time will be added.
Conversely, if you get it wrong, your time will be subtracted.
When your time reaches 0, the game is over.
I assure you.
You will be pressed for time and will make mistakes.
You will be pressed for time and will panic.
I guarantee that you will panic within the first minute.
Do you understand how long your concentration lasts?
Playing this game will help you understand how short your concentration lasts.
Have you ever lost concentration and panicked?
You will experience how panicking it becomes impossible to solve simple calculations that anyone can solve.
Play seriously for 3 minutes.
Then you will find out your abilities.

Rules
- If you answer correctly before the gauge in the center of the screen disappears, +5 seconds will be added to your time

(If you get it wrong, -5 seconds will be subtracted)

- Once every 5 questions you get a bonus chance,

If you answer correctly quickly, +10 seconds will be added to your time

(If you get it wrong, -10 seconds will be subtracted)

- If you get a bonus chance, even if the gauge disappears, if you answer correctly, +3 seconds will be added

- The game ends when the time displayed at the top of the screen reaches 0

- If you want to pause the game, press C repeatedly.


If you keep answering correctly quickly, a huge amount of time will be added.

Even at the end of the game, if you answer within 3 seconds, you have a chance to add +10 seconds, so you can always turn a pinch into an opportunity.

---
The game has three modes for both addition and subtraction,

and an edit function is also available.

Customers can freely create their own calculation problems.


## Version history (last 5 releases)

### 2.0.03 — 2025-10-07

The app name has been corrected.
Minor bugs have been fixed.
The sound system has been improved.
Now compatible with iPhone Air.

### 2.0.02 — 2025-01-13

The app name has been changed.
The explanatory image and text have been changed.

### 2.0.01 — 2025-01-08

Changed the iPad screen layout.
Changed the background color.
Fixed a gauge display issue.

### 2.0.00 — 2025-01-02

The game content has been completely revamped.
It has been reborn as a thrilling and entertaining game.

The system has been revised.
Operability has been improved.
The screen design has been changed.

### 1.0.03 — 2024-12-13

The category has been changed.
The subtitle has been changed.

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## More apps by hideo nakamura

- [TimeSignal Alarm clock](https://appshunter.io/ios/app/timesignal-alarm-clock/id1242808815)
- [JANKEN 2024](https://appshunter.io/ios/app/janken-2024/id1406641550)
- [MULTI TIMER 2024](https://appshunter.io/ios/app/multi-timer-2024/id1447927529)
- [KEEPER - Time management tool](https://appshunter.io/ios/app/keeper-time-management-tool/id6502432858)
- [Alarm Clock / Time Signal](https://appshunter.io/ios/app/alarm-clock-time-signal/id6590632574)
- [Circle timer - pie chart timer](https://appshunter.io/ios/app/circle-timer-pie-chart-timer/id6686403808)

All apps by hideo nakamura: https://appshunter.io/developer/1242808811

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*