# Mental Math for Work — Business estimates in 3 min

> Business estimates in 3 min (iPhone/iPad app by Shota Morioka.)

- Source: https://appshunter.io/ios/app/mental-math-for-work/id6766879948 (this page in markdown: same URL + `.md`)
- Developer: [Shota Morioka](https://appshunter.io/developer/483674380)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 15 MB
- Languages: English
- Released: 2026-05-07
- Data updated: 2026-08-03
- User reviews in markdown: https://appshunter.io/ios/app/mental-math-for-work/id6766879948/reviews.md

## What is Mental Math for Work?

Mental Math for Work helps you practice quick estimates for meetings, sales calls, planning reviews, product discussions, and case interviews.

Train with business-context drills for gross margin, discounts, KPI, CVR, CPA, SaaS metrics, workload estimates, sales tax estimates, and engineering rough calculations.

Features
- Short daily quests designed for 3 to 5 minute practice
- Role-based courses for sales, PM/PdM, planning, engineering management, retail/e-commerce, case interviews, and basics
- Category practice for the work math you need most
- Estimate OK judgment for practical ranges, not only exact answers
- Weak-point review, time attack, and meeting mode
- Accuracy, speed, estimate OK rate, and category trends

Start with the free daily quest. Premium unlocks category practice, weak-point review, speed training, meeting mode, and detailed progress insights.

Build the number reflexes you need at work, one short session at a time.

Terms of Use: https://shigoto-no-anzan.pages.dev/legal/terms/
Privacy Policy: https://shigoto-no-anzan.pages.dev/legal/privacy/
Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Lifetime | $9.99 | one-time |



## Version history (last 5 releases)

### 1.10 — 2026-07-28

Strengthened usage analytics to better understand drop-off during practice and improve the onboarding and premium paths. Core features and purchases are unchanged.

### 1.9 — 2026-07-19

Updated the minimum supported OS to make the app available on more iPhone and iPad devices. We also improved the App Store search metadata.

### 1.8 — 2026-07-07

Adjusted the in-app rating request timing so engaged users see it at a more natural moment. Also cleaned up analytics event names for clearer measurement.

### 1.7 — 2026-07-03

Updated App Store screenshots for better readability.

### 1.6 — 2026-06-15

Added English localization for US users, including business-focused problem text, localized app display name, and updated work-math categories.

## More apps by Shota Morioka

- [Photo Resizer - Minify](https://appshunter.io/ios/app/photo-resizer-minify/id6757232312)
- [Koehira: 会議録音と文字起こし](https://appshunter.io/ios/app/koehira/id6775134922)

All apps by Shota Morioka: https://appshunter.io/developer/483674380

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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 2026-08-03.*