# MathGrid 100 — AI-graded math drill scanner

> AI-graded math drill scanner (iPhone/iPad app by Hiroyuki Ishikawa.)

- Source: https://appshunter.io/ios/app/mathgrid-100/id6759038224 (this page in markdown: same URL + `.md`)
- Developer: [Hiroyuki Ishikawa](https://appshunter.io/developer/1876490408)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 40 MB
- Languages: American English, Japanese
- Released: 2026-02-16
- Data updated: 2026-07-17
- User reviews in markdown: https://appshunter.io/ios/app/mathgrid-100/id6759038224/reviews.md

## What is MathGrid 100?

MathGrid 100 — Photo-graded math drills for daily mental math practice.

Known in Japan as "Hyakumasu Keisan" (百マス計算 / 100-square calculation), this classic drill is a proven method for building mental math fluency, recommended by Japanese educators such as Hideo Kageyama. MathGrid 100 brings this method to your iPhone with AI-powered photo grading: just snap a picture of the completed worksheet and get an instant score.

【Features】

* Camera-based instant grading — no typing required
* Supports addition and multiplication
* 9×9 (multiplication) and 10×10 grids
* Review and manually edit each cell if needed
* Saves up to 20 sessions in history
* Points, levels, and badges to keep kids motivated
* Daily streak tracking
* Up to 4 separate child profiles with individual progress

【Great for】

* Parents tired of manually grading drill sheets
* Tracking your child's daily practice
* Gamifying repetitive practice to keep kids engaged
* Supplementing Kumon, abacus class, or other math curricula

※ Internet connection required (handwriting recognition runs in the cloud).

※ This app shows a persistent banner ad and an interstitial ad after every few gradings.


## Version history (last 5 releases)

### 2.1.0 — 2026-07-03

[View your worksheet photos in History]
Tap any past grading to see a large view of the worksheet photo you took. It's now easy to look back at which sheet was graded.
[Also]
- Minor bug fixes and improvements
Thank you for using MathGrid 100.

### 2.0.2 — 2026-06-10

[Faster grading]
We optimized the AI grading engine so your score appears more quickly after you take a photo — same accuracy, snappier experience.

Thank you for using MathGrid 100. We'll keep making it better.

### 2.0.1 — 2026-06-06

Thank you for using MathGrid 100.

[Important] Fixed an issue where grading stopped working
Due to a change in the underlying AI service, some users saw a "Specified model not found" message and could not grade their worksheets. This update switches to the latest AI model so grading works as usual again.

We apologize for the inconvenience. Everything should be back to normal after updating.

### 2.0 — 2026-05-15

[Improved grading accuracy]
- Smarter recognition logic now auto-corrects misread headers and answers.
[Retake before grading]
- You can now retake the photo right from the review screen.
[others]
- New persistent banner ad above the tab bar
- Various bug fixes and UI polish

### 1.0 — 2026-02-16

No release notes.

## More apps by Hiroyuki Ishikawa

- [Kawaii*Calc - Cute Calculator](https://appshunter.io/ios/app/kawaiicalc-cute-calculator/id6759555566)
- [Kawaii*Memo - Cute Notepad](https://appshunter.io/ios/app/kawaiimemo-cute-notepad/id6759860672)
- [Kawaii Calendar: Cute Planner](https://appshunter.io/ios/app/kawaii-calendar-cute-planner/id6775191338)
- [4 in a Row NEO](https://appshunter.io/ios/app/4-in-a-row-neo/id6775501120)

All apps by Hiroyuki Ishikawa: https://appshunter.io/developer/1876490408

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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 2026-07-17.*