Apps by Katsuhiko Yao
GridCalculation app icon

Education

GridCalculation

Katsuhiko Yao

Free download In-app purchases unconfirmed
Open on Apple

About this app

GridCalculation is a math learning app that uses grids to help students discover patterns and relationships in numbers. Practice addition, subtraction, multiplication, division, decimals, negative numbers, and scaling relationships between divisors and quotients through visual learning. Features: • Grid-based math practice • Addition, subtraction, multiplication, and division • Decimal calculations • Negative number calculations • Quotient and remainder exercises • Scaling Division mode • Multiple difficulty levels • Simple and focused learning experience Designed for elementary and middle school students to build strong calculation skills and mathematical understanding.

Latest release

What’s New

Version 2.2.0 Aug 6, 2026

Added a confirmation before checking answers. * A confirmation dialog is now displayed if there are unanswered cells. * This helps prevent accidentally checking answers before finishing your work. * Improved overall usability and user experience. 未入力時の確認機能を追加しました! ・未入力のセルがある場合、答え合わせを行う前に確認画面を表示するよう改善しました。 ・誤って答え合わせを押してしまう操作を防ぎ、安心して学習できるようになりました。 ・細かな操作性を改善しました。

Audience growth

Ratings growth

Steady
7-day gain +0
Ratings / day 0.0
30-day gain +0
US rating-count history
0 ratings
0 Aug 12, 2026 · 0 ratings Aug 12, 2026

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking

Price intelligence

1 captured event
Current Free
Historical low Free
Paid → free
Price history
Current Free
Free Aug 12, 2026 · Free Aug 12, 2026

First snapshot captured. The trend line starts after the next crawler price observation.

  1. First observed Aug 12, 2026 · 5:28 PM Free

Screenshots

GridCalculation iPhone screenshotGridCalculation iPhone screenshotGridCalculation iPhone screenshot