MathGrid 100

Photograph your child's 100-square math drill and let AI grade it instantly. Track streaks, earn badges, and build mental math fluency every day.

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.